blob: ac63259424e16515c9138d5e9be2c9254b4aa21d [file] [log] [blame]
// 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.
#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.
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;
// 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;
typedef long long int64;
// 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;
// See the comment above about NSPR and 64-bit.
#if __LP64__
typedef unsigned long uint64;
typedef unsigned long long uint64;
#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
TypeName(const TypeName&); \
void operator=(const TypeName&)
// 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];
#if !defined(arraysize)
#define arraysize(array) (sizeof(ArraySizeHelper(array)))
// 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)
((sizeof(a) / sizeof(*(a))) / \
static_cast<size_t>(!(sizeof(a) % sizeof(*(a)))))
// 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:
// 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]
} // namespace phonenumbers
} // namespace i18n