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Diffstat (limited to 'base/basictypes.h')
| -rw-r--r-- | base/basictypes.h | 204 |
1 files changed, 204 insertions, 0 deletions
diff --git a/base/basictypes.h b/base/basictypes.h new file mode 100644 index 0000000..ac63259 --- /dev/null +++ b/base/basictypes.h @@ -0,0 +1,204 @@ +// Copyright (c) 2010 The Chromium Authors. All rights reserved. +// Use of this source code is governed by a BSD-style license that can be +// found in the LICENSE file. + +#ifndef I18N_PHONENUMBERS_BASE_BASICTYPES_H_ +#define I18N_PHONENUMBERS_BASE_BASICTYPES_H_ + +#include <limits.h> // So we can set the bounds of our types +#include <stddef.h> // For size_t +#include <string.h> // for memcpy + +#if !defined(_WIN32) +// stdint.h is part of C99 but MSVC doesn't have it. +#include <stdint.h> // For intptr_t. +#endif + +namespace i18n { +namespace phonenumbers { + +#ifdef INT64_MAX + +// INT64_MAX is defined if C99 stdint.h is included; use the +// native types if available. +typedef int8_t int8; +typedef int16_t int16; +typedef int32_t int32; +typedef int64_t int64; +typedef uint8_t uint8; +typedef uint16_t uint16; +typedef uint32_t uint32; +typedef uint64_t uint64; + +const uint8 kuint8max = UINT8_MAX; +const uint16 kuint16max = UINT16_MAX; +const uint32 kuint32max = UINT32_MAX; +const uint64 kuint64max = UINT64_MAX; +const int8 kint8min = INT8_MIN; +const int8 kint8max = INT8_MAX; +const int16 kint16min = INT16_MIN; +const int16 kint16max = INT16_MAX; +const int32 kint32min = INT32_MIN; +const int32 kint32max = INT32_MAX; +const int64 kint64min = INT64_MIN; +const int64 kint64max = INT64_MAX; + +#else // !INT64_MAX + +typedef signed char int8; +typedef short int16; +// TODO: Remove these type guards. These are to avoid conflicts with +// obsolete/protypes.h in the Gecko SDK. +#ifndef _INT32 +#define _INT32 +typedef int int32; +#endif + +// The NSPR system headers define 64-bit as |long| when possible. In order to +// not have typedef mismatches, we do the same on LP64. +#if __LP64__ +typedef long int64; +#else +typedef long long int64; +#endif + +// NOTE: unsigned types are DANGEROUS in loops and other arithmetical +// places. Use the signed types unless your variable represents a bit +// pattern (eg a hash value) or you really need the extra bit. Do NOT +// use 'unsigned' to express "this value should always be positive"; +// use assertions for this. + +typedef unsigned char uint8; +typedef unsigned short uint16; +// TODO: Remove these type guards. These are to avoid conflicts with +// obsolete/protypes.h in the Gecko SDK. +#ifndef _UINT32 +#define _UINT32 +typedef unsigned int uint32; +#endif + +// See the comment above about NSPR and 64-bit. +#if __LP64__ +typedef unsigned long uint64; +#else +typedef unsigned long long uint64; +#endif + +#endif // !INT64_MAX + +typedef signed char schar; + +// A type to represent a Unicode code-point value. As of Unicode 4.0, +// such values require up to 21 bits. +// (For type-checking on pointers, make this explicitly signed, +// and it should always be the signed version of whatever int32 is.) +typedef signed int char32; + +// A macro to disallow the copy constructor and operator= functions +// This should be used in the private: declarations for a class +#if !defined(DISALLOW_COPY_AND_ASSIGN) +#define DISALLOW_COPY_AND_ASSIGN(TypeName) \ + TypeName(const TypeName&); \ + void operator=(const TypeName&) +#endif + +// The arraysize(arr) macro returns the # of elements in an array arr. +// The expression is a compile-time constant, and therefore can be +// used in defining new arrays, for example. If you use arraysize on +// a pointer by mistake, you will get a compile-time error. +// +// One caveat is that arraysize() doesn't accept any array of an +// anonymous type or a type defined inside a function. In these rare +// cases, you have to use the unsafe ARRAYSIZE_UNSAFE() macro below. This is +// due to a limitation in C++'s template system. The limitation might +// eventually be removed, but it hasn't happened yet. + +// This template function declaration is used in defining arraysize. +// Note that the function doesn't need an implementation, as we only +// use its type. +template <typename T, size_t N> +char (&ArraySizeHelper(T (&array)[N]))[N]; + +// That gcc wants both of these prototypes seems mysterious. VC, for +// its part, can't decide which to use (another mystery). Matching of +// template overloads: the final frontier. +#ifndef _MSC_VER +template <typename T, size_t N> +char (&ArraySizeHelper(const T (&array)[N]))[N]; +#endif + +#if !defined(arraysize) +#define arraysize(array) (sizeof(ArraySizeHelper(array))) +#endif + +// ARRAYSIZE_UNSAFE performs essentially the same calculation as arraysize, +// but can be used on anonymous types or types defined inside +// functions. It's less safe than arraysize as it accepts some +// (although not all) pointers. Therefore, you should use arraysize +// whenever possible. +// +// The expression ARRAYSIZE_UNSAFE(a) is a compile-time constant of type +// size_t. +// +// ARRAYSIZE_UNSAFE catches a few type errors. If you see a compiler error +// +// "warning: division by zero in ..." +// +// when using ARRAYSIZE_UNSAFE, you are (wrongfully) giving it a pointer. +// You should only use ARRAYSIZE_UNSAFE on statically allocated arrays. +// +// The following comments are on the implementation details, and can +// be ignored by the users. +// +// ARRAYSIZE_UNSAFE(arr) works by inspecting sizeof(arr) (the # of bytes in +// the array) and sizeof(*(arr)) (the # of bytes in one array +// element). If the former is divisible by the latter, perhaps arr is +// indeed an array, in which case the division result is the # of +// elements in the array. Otherwise, arr cannot possibly be an array, +// and we generate a compiler error to prevent the code from +// compiling. +// +// Since the size of bool is implementation-defined, we need to cast +// !(sizeof(a) & sizeof(*(a))) to size_t in order to ensure the final +// result has type size_t. +// +// This macro is not perfect as it wrongfully accepts certain +// pointers, namely where the pointer size is divisible by the pointee +// size. Since all our code has to go through a 32-bit compiler, +// where a pointer is 4 bytes, this means all pointers to a type whose +// size is 3 or greater than 4 will be (righteously) rejected. + +#if !defined(ARRAYSIZE_UNSAFE) +#define ARRAYSIZE_UNSAFE(a) \ + ((sizeof(a) / sizeof(*(a))) / \ + static_cast<size_t>(!(sizeof(a) % sizeof(*(a))))) +#endif + +// The COMPILE_ASSERT macro can be used to verify that a compile time +// expression is true. For example, you could use it to verify the +// size of a static array: +// +// COMPILE_ASSERT(ARRAYSIZE_UNSAFE(content_type_names) == CONTENT_NUM_TYPES, +// content_type_names_incorrect_size); +// +// or to make sure a struct is smaller than a certain size: +// +// COMPILE_ASSERT(sizeof(foo) < 128, foo_too_large); +// +// The second argument to the macro is the name of the variable. If +// the expression is false, most compilers will issue a warning/error +// containing the name of the variable. + +template <bool> +struct CompileAssert { +}; + +#if !defined(COMPILE_ASSERT) +#define COMPILE_ASSERT(expr, msg) \ + typedef CompileAssert<(bool(expr))> msg[bool(expr) ? 1 : -1] +#endif + +} // namespace phonenumbers +} // namespace i18n + +#endif // I18N_PHONENUMBERS_BASE_BASICTYPES_H_ |