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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@135867 91177308-0d34-0410-b5e6-96231b3b80d8
220 lines
5.9 KiB
C++
220 lines
5.9 KiB
C++
//===--- ArrayRef.h - Array Reference Wrapper -------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ADT_ARRAYREF_H
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#define LLVM_ADT_ARRAYREF_H
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#include "llvm/ADT/SmallVector.h"
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#include <vector>
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namespace llvm {
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class APInt;
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/// ArrayRef - Represent a constant reference to an array (0 or more elements
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/// consecutively in memory), i.e. a start pointer and a length. It allows
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/// various APIs to take consecutive elements easily and conveniently.
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///
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/// This class does not own the underlying data, it is expected to be used in
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/// situations where the data resides in some other buffer, whose lifetime
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/// extends past that of the ArrayRef. For this reason, it is not in general
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/// safe to store an ArrayRef.
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///
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/// This is intended to be trivially copyable, so it should be passed by
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/// value.
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template<typename T>
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class ArrayRef {
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public:
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typedef const T *iterator;
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typedef const T *const_iterator;
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typedef size_t size_type;
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private:
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/// The start of the array, in an external buffer.
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const T *Data;
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/// The number of elements.
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size_type Length;
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public:
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/// @name Constructors
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/// @{
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/// Construct an empty ArrayRef.
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/*implicit*/ ArrayRef() : Data(0), Length(0) {}
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/// Construct an ArrayRef from a single element.
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/*implicit*/ ArrayRef(const T &OneElt)
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: Data(&OneElt), Length(1) {}
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/// Construct an ArrayRef from a pointer and length.
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/*implicit*/ ArrayRef(const T *data, size_t length)
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: Data(data), Length(length) {}
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/// Construct an ArrayRef from a range.
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ArrayRef(const T *begin, const T *end)
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: Data(begin), Length(end - begin) {}
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/// Construct an ArrayRef from a SmallVector.
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/*implicit*/ ArrayRef(const SmallVectorImpl<T> &Vec)
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: Data(Vec.data()), Length(Vec.size()) {}
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/// Construct an ArrayRef from a std::vector.
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/*implicit*/ ArrayRef(const std::vector<T> &Vec)
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: Data(Vec.empty() ? (T*)0 : &Vec[0]), Length(Vec.size()) {}
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/// Construct an ArrayRef from a C array.
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template <size_t N>
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/*implicit*/ ArrayRef(const T (&Arr)[N])
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: Data(Arr), Length(N) {}
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/// @}
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/// @name Simple Operations
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/// @{
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iterator begin() const { return Data; }
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iterator end() const { return Data + Length; }
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/// empty - Check if the array is empty.
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bool empty() const { return Length == 0; }
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const T *data() const { return Data; }
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/// size - Get the array size.
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size_t size() const { return Length; }
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/// front - Get the first element.
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const T &front() const {
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assert(!empty());
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return Data[0];
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}
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/// back - Get the last element.
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const T &back() const {
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assert(!empty());
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return Data[Length-1];
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}
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/// equals - Check for element-wise equality.
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bool equals(ArrayRef RHS) const {
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if (Length != RHS.Length)
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return false;
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for (size_type i = 0; i != Length; i++)
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if (Data[i] != RHS.Data[i])
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return false;
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return true;
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}
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/// slice(n) - Chop off the first N elements of the array.
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ArrayRef<T> slice(unsigned N) {
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assert(N <= size() && "Invalid specifier");
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return ArrayRef<T>(data()+N, size()-N);
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}
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/// slice(n, m) - Chop off the first N elements of the array, and keep M
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/// elements in the array.
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ArrayRef<T> slice(unsigned N, unsigned M) {
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assert(N+M <= size() && "Invalid specifier");
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return ArrayRef<T>(data()+N, M);
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}
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/// @}
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/// @name Operator Overloads
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/// @{
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const T &operator[](size_t Index) const {
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assert(Index < Length && "Invalid index!");
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return Data[Index];
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}
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/// @}
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/// @name Expensive Operations
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/// @{
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std::vector<T> vec() const {
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return std::vector<T>(Data, Data+Length);
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}
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/// @}
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/// @name Conversion operators
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/// @{
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operator std::vector<T>() const {
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return std::vector<T>(Data, Data+Length);
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}
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/// @}
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};
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/// @name ArrayRef Convenience constructors
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/// @{
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/// Construct an ArrayRef from a single element.
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template<typename T>
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ArrayRef<T> makeArrayRef(const T &OneElt) {
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return OneElt;
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}
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/// Construct an ArrayRef from a pointer and length.
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template<typename T>
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ArrayRef<T> makeArrayRef(const T *data, size_t length) {
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return ArrayRef<T>(data, length);
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}
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/// Construct an ArrayRef from a range.
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template<typename T>
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ArrayRef<T> makeArrayRef(const T *begin, const T *end) {
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return ArrayRef<T>(begin, end);
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}
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/// Construct an ArrayRef from a SmallVector.
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template <typename T>
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ArrayRef<T> makeArrayRef(const SmallVectorImpl<T> &Vec) {
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return Vec;
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}
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/// Construct an ArrayRef from a SmallVector.
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template <typename T, unsigned N>
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ArrayRef<T> makeArrayRef(const SmallVector<T, N> &Vec) {
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return Vec;
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}
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/// Construct an ArrayRef from a std::vector.
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template<typename T>
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ArrayRef<T> makeArrayRef(const std::vector<T> &Vec) {
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return Vec;
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}
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/// Construct an ArrayRef from a C array.
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template<typename T, size_t N>
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ArrayRef<T> makeArrayRef(const T (&Arr)[N]) {
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return ArrayRef<T>(Arr);
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}
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/// @}
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/// @name ArrayRef Comparison Operators
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/// @{
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template<typename T>
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inline bool operator==(ArrayRef<T> LHS, ArrayRef<T> RHS) {
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return LHS.equals(RHS);
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}
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template<typename T>
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inline bool operator!=(ArrayRef<T> LHS, ArrayRef<T> RHS) {
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return !(LHS == RHS);
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}
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/// @}
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// ArrayRefs can be treated like a POD type.
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template <typename T> struct isPodLike;
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template <typename T> struct isPodLike<ArrayRef<T> > {
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static const bool value = true;
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};
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}
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#endif
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