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463 lines
23 KiB
C++
463 lines
23 KiB
C++
//===- llvm/System/Path.h - Path Operating System Concept -------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by Reid Spencer and is distributed under the
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// University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file declares the llvm::sys::Path class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_SYSTEM_PATH_H
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#define LLVM_SYSTEM_PATH_H
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#include <string>
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#include <vector>
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namespace llvm {
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namespace sys {
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/// This class provides an abstraction for the path to a file or directory
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/// in the operating system's filesystem and provides various basic operations
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/// on it. Note that this class only represents the name of a path to a file
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/// or directory which may or may not be valid for a given machine's file
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/// system. A Path ensures that the name it encapsulates is syntactical valid
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/// for the operating system it is running on but does not ensure correctness
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/// for any particular file system. A Path either references a file or a
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/// directory and the distinction is consistently maintained. Most operations
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/// on the class have invariants that require the Path object to be either a
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/// file path or a directory path, but not both. Those operations will also
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/// leave the object as either a file path or object path. There is exactly
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/// one invalid Path which is the empty path. The class should never allow any
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/// other syntactically invalid non-empty path name to be assigned. Empty
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/// paths are required in order to indicate an error result. If the path is
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/// empty, the is_valid operation will return false. All operations will fail
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/// if is_valid is false. Operations that change the path will either return
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/// false if it would cause a syntactically invalid path name (in which case
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/// the Path object is left unchanged) or throw an std::string exception
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/// indicating the error.
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/// @since 1.4
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/// @brief An abstraction for operating system paths.
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class Path {
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/// @name Constructors
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/// @{
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public:
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/// Construct a path to the root directory of the file system. The root
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/// directory is a top level directory above which there are no more
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/// directories. For example, on UNIX, the root directory is /. On Windows
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/// it is C:\. Other operating systems may have different notions of
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/// what the root directory is.
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/// @throws nothing
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static Path GetRootDirectory();
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/// Construct a path to a unique temporary directory that is created in
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/// a "standard" place for the operating system. The directory is
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/// guaranteed to be created on exit from this function. If the directory
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/// cannot be created, the function will throw an exception.
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/// @throws std::string indicating why the directory could not be created.
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/// @brief Constrct a path to an new, unique, existing temporary
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/// directory.
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static Path GetTemporaryDirectory();
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/// Determine the platform-specific location of a library by first
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/// searching a list of library paths, then searching a list of "well
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/// known" paths for the platform. T
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/// @returns a valid Path object if the library was found, an invalid
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/// one otherwise.
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/// @throws nothing
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/// @brief Locate a library in a platform specific manner.
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static Path GetLibraryPath(const std::string& basename,
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const std::vector<std::string>& LibPaths);
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///
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/// Construct a path to the first system library directory. The
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/// implementation of Path on a given platform must ensure that this
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/// directory both exists and also contains standard system libraries
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/// suitable for linking into programs.
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/// @throws nothing
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/// @brief Construct a path to the first system library directory
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static Path GetSystemLibraryPath1();
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/// Construct a path to the second system library directory. The
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/// implementation of Path on a given platform must ensure that this
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/// directory both exists and also contains standard system libraries
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/// suitable for linking into programs. Note that the "second" system
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/// library directory may or may not be different from the first.
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/// @throws nothing
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/// @brief Construct a path to the second system library directory
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static Path GetSystemLibraryPath2();
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/// Construct a path to the default LLVM configuration directory. The
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/// implementation must ensure that this is a well-known (same on many
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/// systems) directory in which llvm configuration files exist. For
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/// example, on Unix, the /etc/llvm directory has been selected.
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/// @throws nothing
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/// @brief Construct a path to the default LLVM configuration directory
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static Path GetLLVMDefaultConfigDir();
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/// Construct a path to the LLVM installed configuration directory. The
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/// implementation must ensure that this refers to the "etc" directory of
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/// the LLVM installation. This is the location where configuration files
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/// will be located for a particular installation of LLVM on a machine.
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/// @throws nothing
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/// @brief Construct a path to the LLVM installed configuration directory
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static Path GetLLVMConfigDir();
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/// Construct a path to the current user's home directory. The
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/// implementation must use an operating system specific mechanism for
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/// determining the user's home directory. For example, the environment
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/// variable "HOME" could be used on Unix. If a given operating system
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/// does not have the concept of a user's home directory, this static
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/// constructor must provide the same result as GetRootDirectory.
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/// @throws nothing
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/// @brief Construct a path to the current user's "home" directory
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static Path GetUserHomeDirectory();
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/// Return the suffix commonly used on file names that contain a shared
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/// object, shared archive, or dynamic link library. Such files are
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/// linked at runtime into a process and their code images are shared
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/// between processes.
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/// @returns The dynamic link library suffix for the current platform.
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/// @brief Return the dynamic link library suffix.
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static std::string GetDLLSuffix();
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/// This is one of the very few ways in which a path can be constructed
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/// with a syntactically invalid name. The only *legal* invalid name is an
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/// empty one. Other invalid names are not permitted. Empty paths are
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/// provided so that they can be used to indicate null or error results in
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/// other lib/System functionality.
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/// @throws nothing
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/// @brief Construct an empty (and invalid) path.
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Path() : path() {}
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/// This constructor will accept a std::string as a path but if verifies
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/// that the path string has a legal syntax for the operating system on
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/// which it is running. This allows a path to be taken in from outside
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/// the program. However, if the path is not valid, the Path object will
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/// be set to an empty string and an exception will be thrown.
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/// @throws std::string if the path string is not legal.
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/// @param unvalidated_path The path to verify and assign.
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/// @brief Construct a Path from a string.
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explicit Path(std::string unverified_path);
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/// @}
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/// @name Operators
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/// @{
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public:
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/// Makes a copy of \p that to \p this.
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/// @returns \p this
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/// @throws nothing
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/// @brief Assignment Operator
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Path & operator = ( const Path & that ) {
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path = that.path;
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return *this;
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}
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/// Compares \p this Path with \p that Path for equality.
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/// @returns true if \p this and \p that refer to the same thing.
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/// @throws nothing
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/// @brief Equality Operator
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bool operator == (const Path& that) const {
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return 0 == path.compare(that.path) ;
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}
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/// Compares \p this Path with \p that Path for inequality.
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/// @returns true if \p this and \p that refer to different things.
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/// @throws nothing
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/// @brief Inequality Operator
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bool operator !=( const Path & that ) const {
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return 0 != path.compare( that.path );
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}
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/// Determines if \p this Path is less than \p that Path. This is required
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/// so that Path objects can be placed into ordered collections (e.g.
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/// std::map). The comparison is done lexicographically as defined by
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/// the std::string::compare method.
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/// @returns true if \p this path is lexicographically less than \p that.
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/// @throws nothing
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/// @brief Less Than Operator
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bool operator< (const Path& that) const {
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return 0 > path.compare( that.path );
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}
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/// @}
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/// @name Accessors
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/// @{
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public:
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/// This function will use an operating system specific algorithm to
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/// determine if the current value of \p this is a syntactically valid
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/// path name for the operating system. The path name does not need to
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/// exist, validity is simply syntactical. Empty paths are always invalid.
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/// @returns true iff the path name is syntactically legal for the
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/// host operating system.
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/// @brief Determine if a path is syntactically valid or not.
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bool is_valid() const;
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/// This function determines if the contents of the path name are
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/// empty. That is, the path has a zero length.
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/// @returns true iff the path is empty.
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/// @brief Determines if the path name is empty (invalid).
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bool is_empty() const { return path.empty(); }
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/// This function determines if the path name in this object is intended
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/// to reference a legal file name (as opposed to a directory name). This
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/// function does not verify anything with the file system, it merely
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/// determines if the syntax of the path represents a file name or not.
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/// @returns true if this path name references a file.
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/// @brief Determines if the path name references a file.
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bool is_file() const;
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/// This function determines if the path name in this object is intended
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/// to reference a legal directory name (as opposed to a file name). This
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/// function does not verify anything with the file system, it merely
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/// determines if the syntax of the path represents a directory name or
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/// not.
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/// @returns true if the path name references a directory
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/// @brief Determines if the path name references a directory.
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bool is_directory() const;
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/// This function determines if the path name in this object references
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/// the root (top level directory) of the file system. The details of what
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/// is considered the "root" may vary from system to system so this method
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/// will do the necessary checking.
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/// @returns true iff the path name references the root directory.
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/// @brief Determines if the path references the root directory.
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bool is_root_directory() const;
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/// This function opens the file associated with the path name provided by
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/// the Path object and reads its magic number. If the magic number at the
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/// start of the file matches \p magic, true is returned. In all other
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/// cases (file not found, file not accessible, etc.) it returns false.
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/// @returns true if the magic number of the file matches \p magic.
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/// @brief Determine if file has a specific magic number
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bool has_magic_number(const std::string& magic) const;
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/// This function determines if the path name in the object references an
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/// archive file by looking at its magic number.
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/// @returns true if the file starts with the magic number for an archive
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/// file.
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/// @brief Determine if the path references an archive file.
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bool is_archive() const;
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/// This function determines if the path name in the object references an
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/// LLVM Bytecode file by looking at its magic number.
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/// @returns true if the file starts with the magic number for LLVM
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/// bytecode files.
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/// @brief Determine if the path references a bytecode file.
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bool is_bytecode_file() const;
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/// This function determines if the path name references an existing file
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/// or directory in the file system. Unlike is_file and is_directory, this
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/// function actually checks for the existence of the file or directory.
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/// @returns true if the pathname references an existing file.
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/// @brief Determines if the path is a file or directory in
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/// the file system.
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bool exists() const;
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/// This function determines if the path name references a readable file
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/// or directory in the file system. Unlike is_file and is_directory, this
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/// function actually checks for the existence and readability (by the
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/// current program) of the file or directory.
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/// @returns true if the pathname references a readable file.
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/// @brief Determines if the path is a readable file or directory
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/// in the file system.
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bool readable() const;
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/// This function determines if the path name references a writable file
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/// or directory in the file system. Unlike is_file and is_directory, this
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/// function actually checks for the existence and writability (by the
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/// current program) of the file or directory.
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/// @returns true if the pathname references a writable file.
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/// @brief Determines if the path is a writable file or directory
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/// in the file system.
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bool writable() const;
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/// This function determines if the path name references an executable
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/// file in the file system. Unlike is_file and is_directory, this
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/// function actually checks for the existence and executability (by
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/// the current program) of the file.
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/// @returns true if the pathname references an executable file.
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/// @brief Determines if the path is an executable file in the file
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/// system.
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bool executable() const;
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/// This function returns the current contents of the path as a
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/// std::string. This allows the underlying path string to be manipulated
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/// by other software.
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/// @returns std::string containing the path name.
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/// @brief Returns the path as a std::string.
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std::string get() const { return path; }
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/// This function returns the last component of the path name. If the
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/// is_directory() function would return true then this returns the name
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/// of the last directory in the path. If the is_file() function would
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/// return true then this function returns the name of the file without
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/// any of the preceding directories.
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/// @returns std::string containing the last component of the path name.
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/// @brief Returns the last component of the path name.
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std::string getLast() const;
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/// This function strips off the path and suffix of the file name and
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/// returns just the basename.
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/// @returns std::string containing the basename of the path
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/// @throws nothing
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/// @brief Get the base name of the path
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std::string get_basename() const;
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/// @returns a c string containing the path name.
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/// @brief Returns the path as a C string.
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const char* const c_str() const { return path.c_str(); }
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/// @}
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/// @name Mutators
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/// @{
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public:
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/// The path name is cleared and becomes empty. This is an invalid
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/// path name but is the *only* invalid path name. This is provided
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/// so that path objects can be used to indicate the lack of a
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/// valid path being found.
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void clear() { path.clear(); }
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/// This method attempts to set the Path object to \p unverified_path
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/// and interpret the name as a directory name. The \p unverified_path
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/// is verified. If verification succeeds then \p unverified_path
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/// is accepted as a directory and true is returned. Otherwise,
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/// the Path object remains unchanged and false is returned.
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/// @returns true if the path was set, false otherwise.
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/// @param unverified_path The path to be set in Path object.
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/// @throws nothing
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/// @brief Set a full path from a std::string
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bool set_directory(const std::string& unverified_path);
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/// This method attempts to set the Path object to \p unverified_path
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/// and interpret the name as a file name. The \p unverified_path
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/// is verified. If verification succeeds then \p unverified_path
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/// is accepted as a file name and true is returned. Otherwise,
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/// the Path object remains unchanged and false is returned.
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/// @returns true if the path was set, false otherwise.
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/// @param unverified_path The path to be set in Path object.
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/// @throws nothing
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/// @brief Set a full path from a std::string
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bool set_file(const std::string& unverified_path);
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/// The \p dirname is added to the end of the Path if it is a legal
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/// directory name for the operating system. The precondition for this
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/// function is that the Path must reference a directory name (i.e.
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/// is_directory() returns true).
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/// @param dirname A string providing the directory name to
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/// be added to the end of the path.
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/// @returns false if the directory name could not be added
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/// @throws nothing
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/// @brief Adds the name of a directory to a Path.
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bool append_directory( const std::string& dirname );
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/// One directory component is removed from the Path name. The Path must
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/// refer to a non-root directory name (i.e. is_directory() returns true
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/// but is_root_directory() returns false). Upon exit, the Path will
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/// refer to the directory above it.
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/// @throws nothing
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/// @returns false if the directory name could not be removed.
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/// @brief Removes the last directory component of the Path.
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bool elide_directory();
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/// The \p filename is added to the end of the Path if it is a legal
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/// directory name for the operating system. The precondition for this
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/// function is that the Path reference a directory name (i.e.
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/// is_directory() returns true).
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/// @throws nothing
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/// @returns false if the file name could not be added.
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/// @brief Appends the name of a file.
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bool append_file( const std::string& filename );
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/// One file component is removed from the Path name. The Path must
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/// refer to a file (i.e. is_file() returns true). Upon exit,
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/// the Path will refer to the directory above it.
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/// @throws nothing
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/// @returns false if the file name could not be removed
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/// @brief Removes the last file component of the path.
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bool elide_file();
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/// A period and the \p suffix are appended to the end of the pathname.
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/// The precondition for this function is that the Path reference a file
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/// name (i.e. is_file() returns true). If the Path is not a file, no
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/// action is taken and the function returns false. If the path would
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/// become invalid for the host operating system, false is returned.
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/// @returns false if the suffix could not be added, true if it was.
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/// @throws nothing
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/// @brief Adds a period and the \p suffix to the end of the pathname.
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bool append_suffix(const std::string& suffix);
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/// The suffix of the filename is removed. The suffix begins with and
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/// includes the last . character in the filename after the last directory
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/// separator and extends until the end of the name. If no . character is
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/// after the last directory separator, then the file name is left
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/// unchanged (i.e. it was already without a suffix) but the function return
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/// false.
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/// @returns false if there was no suffix to remove, true otherwise.
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/// @throws nothing
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/// @brief Remove the suffix from a path name.
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bool elide_suffix();
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/// This method attempts to create a directory in the file system with the
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/// same name as the Path object. The \p create_parents parameter controls
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/// whether intermediate directories are created or not. if \p
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/// create_parents is true, then an attempt will be made to create all
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/// intermediate directories. If \p create_parents is false, then only the
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/// final directory component of the Path name will be created. The
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/// created directory will have no entries.
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/// @returns false if the Path does not reference a directory, true
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/// otherwise.
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/// @param create_parents Determines whether non-existent directory
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/// components other than the last one (the "parents") are created or not.
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/// @throws std::string if an error occurs.
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/// @brief Create the directory this Path refers to.
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bool create_directory( bool create_parents = false );
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/// This method attempts to create a file in the file system with the same
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/// name as the Path object. The intermediate directories must all exist
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/// at the time this method is called. Use create_directories to
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/// accomplish that. The created file will be empty upon return from this
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/// function.
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/// @returns false if the Path does not reference a file, true otherwise.
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/// @throws std::string if an error occurs.
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/// @brief Create the file this Path refers to.
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bool create_file();
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/// This method attempts to destroy the directory named by the last in
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/// the Path name. If \p remove_contents is false, an attempt will be
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/// made to remove just the directory that this Path object refers to
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/// (the final Path component). If \p remove_contents is true, an attempt
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/// will be made to remove the entire contents of the directory,
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/// recursively.
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/// @param destroy_contents Indicates whether the contents of a destroyed
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/// directory should also be destroyed (recursively).
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/// @returns false if the Path does not refer to a directory, true
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/// otherwise.
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/// @throws std::string if there is an error.
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/// @brief Removes the file or directory from the filesystem.
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bool destroy_directory( bool destroy_contents = false );
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/// This method attempts to destroy the file named by the last item in the
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/// Path name.
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/// @returns false if the Path does not refer to a file, true otherwise.
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/// @throws std::string if there is an error.
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/// @brief Destroy the file this Path refers to.
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bool destroy_file();
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/// @}
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/// @name Data
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/// @{
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private:
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std::string path; ///< Platform agnostic storage for the path name.
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/// @}
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};
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}
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}
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// vim: sw=2
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#endif
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