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271 lines
10 KiB
C++
271 lines
10 KiB
C++
// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_BASICTYPES_H_
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#define BASE_BASICTYPES_H_
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#include <limits.h> // So we can set the bounds of our types
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#include <stddef.h> // For size_t
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#include <string.h> // for memcpy
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#include "base/port.h" // Types that only need exist on certain systems
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#include "mozilla/Assertions.h"
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#include "mozilla/IntegerPrintfMacros.h"
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// A type to represent a Unicode code-point value. As of Unicode 4.0,
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// such values require up to 21 bits.
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// (For type-checking on pointers, make this explicitly signed,
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// and it should always be the signed version of whatever int32_t is.)
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typedef signed int char32;
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const uint8_t kuint8max = (( uint8_t) 0xFF);
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const uint16_t kuint16max = ((uint16_t) 0xFFFF);
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const uint32_t kuint32max = ((uint32_t) 0xFFFFFFFF);
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const uint64_t kuint64max = ((uint64_t) GG_LONGLONG(0xFFFFFFFFFFFFFFFF));
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const int8_t kint8min = (( int8_t) 0x80);
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const int8_t kint8max = (( int8_t) 0x7F);
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const int16_t kint16min = (( int16_t) 0x8000);
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const int16_t kint16max = (( int16_t) 0x7FFF);
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const int32_t kint32min = (( int32_t) 0x80000000);
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const int32_t kint32max = (( int32_t) 0x7FFFFFFF);
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const int64_t kint64min = (( int64_t) GG_LONGLONG(0x8000000000000000));
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const int64_t kint64max = (( int64_t) GG_LONGLONG(0x7FFFFFFFFFFFFFFF));
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// Platform- and hardware-dependent printf specifiers
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# if defined(OS_POSIX)
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# define PRId64L "I64d"
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# define PRIu64L "I64u"
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# define PRIx64L "I64x"
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# elif defined(OS_WIN)
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# define PRId64L L"I64d"
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# define PRIu64L L"I64u"
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# define PRIx64L L"I64x"
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# endif
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// A macro to disallow the copy constructor and operator= functions
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// This should be used in the private: declarations for a class
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#undef DISALLOW_COPY_AND_ASSIGN
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#define DISALLOW_COPY_AND_ASSIGN(TypeName) \
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TypeName(const TypeName&); \
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void operator=(const TypeName&)
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// An older, deprecated, politically incorrect name for the above.
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#undef DISALLOW_EVIL_CONSTRUCTORS
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#define DISALLOW_EVIL_CONSTRUCTORS(TypeName) DISALLOW_COPY_AND_ASSIGN(TypeName)
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// A macro to disallow all the implicit constructors, namely the
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// default constructor, copy constructor and operator= functions.
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//
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// This should be used in the private: declarations for a class
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// that wants to prevent anyone from instantiating it. This is
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// especially useful for classes containing only static methods.
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#undef DISALLOW_IMPLICIT_CONSTRUCTORS
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#define DISALLOW_IMPLICIT_CONSTRUCTORS(TypeName) \
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TypeName(); \
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DISALLOW_COPY_AND_ASSIGN(TypeName)
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// The arraysize(arr) macro returns the # of elements in an array arr.
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// The expression is a compile-time constant, and therefore can be
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// used in defining new arrays, for example. If you use arraysize on
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// a pointer by mistake, you will get a compile-time error.
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//
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// One caveat is that arraysize() doesn't accept any array of an
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// anonymous type or a type defined inside a function. In these rare
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// cases, you have to use the unsafe ARRAYSIZE_UNSAFE() macro below. This is
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// due to a limitation in C++'s template system. The limitation might
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// eventually be removed, but it hasn't happened yet.
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// This template function declaration is used in defining arraysize.
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// Note that the function doesn't need an implementation, as we only
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// use its type.
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template <typename T, size_t N>
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char (&ArraySizeHelper(T (&array)[N]))[N];
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// That gcc wants both of these prototypes seems mysterious. VC, for
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// its part, can't decide which to use (another mystery). Matching of
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// template overloads: the final frontier.
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#ifndef _MSC_VER
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template <typename T, size_t N>
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char (&ArraySizeHelper(const T (&array)[N]))[N];
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#endif
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#define arraysize(array) (sizeof(ArraySizeHelper(array)))
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// ARRAYSIZE_UNSAFE performs essentially the same calculation as arraysize,
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// but can be used on anonymous types or types defined inside
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// functions. It's less safe than arraysize as it accepts some
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// (although not all) pointers. Therefore, you should use arraysize
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// whenever possible.
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//
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// The expression ARRAYSIZE_UNSAFE(a) is a compile-time constant of type
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// size_t.
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//
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// ARRAYSIZE_UNSAFE catches a few type errors. If you see a compiler error
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//
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// "warning: division by zero in ..."
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//
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// when using ARRAYSIZE_UNSAFE, you are (wrongfully) giving it a pointer.
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// You should only use ARRAYSIZE_UNSAFE on statically allocated arrays.
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//
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// The following comments are on the implementation details, and can
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// be ignored by the users.
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//
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// ARRAYSIZE_UNSAFE(arr) works by inspecting sizeof(arr) (the # of bytes in
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// the array) and sizeof(*(arr)) (the # of bytes in one array
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// element). If the former is divisible by the latter, perhaps arr is
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// indeed an array, in which case the division result is the # of
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// elements in the array. Otherwise, arr cannot possibly be an array,
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// and we generate a compiler error to prevent the code from
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// compiling.
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//
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// Since the size of bool is implementation-defined, we need to cast
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// !(sizeof(a) & sizeof(*(a))) to size_t in order to ensure the final
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// result has type size_t.
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//
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// This macro is not perfect as it wrongfully accepts certain
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// pointers, namely where the pointer size is divisible by the pointee
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// size. Since all our code has to go through a 32-bit compiler,
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// where a pointer is 4 bytes, this means all pointers to a type whose
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// size is 3 or greater than 4 will be (righteously) rejected.
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#define ARRAYSIZE_UNSAFE(a) \
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((sizeof(a) / sizeof(*(a))) / \
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static_cast<size_t>(!(sizeof(a) % sizeof(*(a)))))
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// Use implicit_cast as a safe version of static_cast or const_cast
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// for upcasting in the type hierarchy (i.e. casting a pointer to Foo
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// to a pointer to SuperclassOfFoo or casting a pointer to Foo to
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// a const pointer to Foo).
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// When you use implicit_cast, the compiler checks that the cast is safe.
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// Such explicit implicit_casts are necessary in surprisingly many
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// situations where C++ demands an exact type match instead of an
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// argument type convertable to a target type.
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//
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// The From type can be inferred, so the preferred syntax for using
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// implicit_cast is the same as for static_cast etc.:
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//
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// implicit_cast<ToType>(expr)
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//
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// implicit_cast would have been part of the C++ standard library,
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// but the proposal was submitted too late. It will probably make
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// its way into the language in the future.
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template<typename To, typename From>
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inline To implicit_cast(From const &f) {
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return f;
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}
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// The COMPILE_ASSERT macro (below) creates an otherwise-unused typedef. This
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// triggers compiler warnings with gcc 4.8 and higher, so mark the typedef
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// as permissibly-unused to disable the warnings.
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# if defined(__GNUC__)
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# define COMPILE_ASSERT_UNUSED_ATTRIBUTE __attribute__((unused))
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# else
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# define COMPILE_ASSERT_UNUSED_ATTRIBUTE /* nothing */
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# endif
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// The COMPILE_ASSERT macro can be used to verify that a compile time
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// expression is true. For example, you could use it to verify the
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// size of a static array:
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//
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// COMPILE_ASSERT(ARRAYSIZE_UNSAFE(content_type_names) == CONTENT_NUM_TYPES,
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// content_type_names_incorrect_size);
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//
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// or to make sure a struct is smaller than a certain size:
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//
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// COMPILE_ASSERT(sizeof(foo) < 128, foo_too_large);
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//
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// The second argument to the macro is the name of the variable. If
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// the expression is false, most compilers will issue a warning/error
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// containing the name of the variable.
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// Avoid multiple definitions for webrtc
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#if !defined(COMPILE_ASSERT)
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template <bool>
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struct CompileAssert {
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};
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#define COMPILE_ASSERT(expr, msg) \
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typedef CompileAssert<(bool(expr))> msg[bool(expr) ? 1 : -1] \
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COMPILE_ASSERT_UNUSED_ATTRIBUTE
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#endif
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// Implementation details of COMPILE_ASSERT:
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//
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// - COMPILE_ASSERT works by defining an array type that has -1
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// elements (and thus is invalid) when the expression is false.
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//
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// - The simpler definition
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//
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// #define COMPILE_ASSERT(expr, msg) typedef char msg[(expr) ? 1 : -1]
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//
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// does not work, as gcc supports variable-length arrays whose sizes
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// are determined at run-time (this is gcc's extension and not part
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// of the C++ standard). As a result, gcc fails to reject the
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// following code with the simple definition:
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//
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// int foo;
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// COMPILE_ASSERT(foo, msg); // not supposed to compile as foo is
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// // not a compile-time constant.
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//
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// - By using the type CompileAssert<(bool(expr))>, we ensures that
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// expr is a compile-time constant. (Template arguments must be
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// determined at compile-time.)
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//
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// - The outter parentheses in CompileAssert<(bool(expr))> are necessary
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// to work around a bug in gcc 3.4.4 and 4.0.1. If we had written
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//
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// CompileAssert<bool(expr)>
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//
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// instead, these compilers will refuse to compile
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//
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// COMPILE_ASSERT(5 > 0, some_message);
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//
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// (They seem to think the ">" in "5 > 0" marks the end of the
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// template argument list.)
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//
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// - The array size is (bool(expr) ? 1 : -1), instead of simply
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//
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// ((expr) ? 1 : -1).
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//
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// This is to avoid running into a bug in MS VC 7.1, which
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// causes ((0.0) ? 1 : -1) to incorrectly evaluate to 1.
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// MetatagId refers to metatag-id that we assign to
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// each metatag <name, value> pair..
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typedef uint32_t MetatagId;
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// Argument type used in interfaces that can optionally take ownership
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// of a passed in argument. If TAKE_OWNERSHIP is passed, the called
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// object takes ownership of the argument. Otherwise it does not.
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enum Ownership {
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DO_NOT_TAKE_OWNERSHIP,
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TAKE_OWNERSHIP
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};
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// The following enum should be used only as a constructor argument to indicate
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// that the variable has static storage class, and that the constructor should
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// do nothing to its state. It indicates to the reader that it is legal to
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// declare a static instance of the class, provided the constructor is given
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// the base::LINKER_INITIALIZED argument. Normally, it is unsafe to declare a
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// static variable that has a constructor or a destructor because invocation
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// order is undefined. However, IF the type can be initialized by filling with
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// zeroes (which the loader does for static variables), AND the destructor also
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// does nothing to the storage, AND there are no virtual methods, then a
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// constructor declared as
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// explicit MyClass(base::LinkerInitialized x) {}
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// and invoked as
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// static MyClass my_variable_name(base::LINKER_INITIALIZED);
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namespace base {
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enum LinkerInitialized { LINKER_INITIALIZED };
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} // base
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#include "nscore.h" // pick up mozalloc operator new() etc.
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#endif // BASE_BASICTYPES_H_
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