97 lines
2.7 KiB
C++
97 lines
2.7 KiB
C++
// Copyright (C) 2005 Davis E. King (davis@dlib.net)
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// License: Boost Software License See LICENSE.txt for the full license.
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#ifndef DLIB_UINtn_
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#define DLIB_UINtn_
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#include "assert.h"
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namespace dlib
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{
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/*!
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uint64 is a typedef for an unsigned integer that is exactly 64 bits wide.
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uint32 is a typedef for an unsigned integer that is exactly 32 bits wide.
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uint16 is a typedef for an unsigned integer that is exactly 16 bits wide.
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uint8 is a typedef for an unsigned integer that is exactly 8 bits wide.
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int64 is a typedef for an integer that is exactly 64 bits wide.
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int32 is a typedef for an integer that is exactly 32 bits wide.
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int16 is a typedef for an integer that is exactly 16 bits wide.
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int8 is a typedef for an integer that is exactly 8 bits wide.
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!*/
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#ifdef __GNUC__
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typedef unsigned long long uint64;
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typedef long long int64;
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#elif defined(__BORLANDC__)
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typedef unsigned __int64 uint64;
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typedef __int64 int64;
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#elif defined(_MSC_VER)
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typedef unsigned __int64 uint64;
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typedef __int64 int64;
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#else
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typedef unsigned long long uint64;
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typedef long long int64;
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#endif
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typedef unsigned short uint16;
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typedef unsigned int uint32;
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typedef unsigned char uint8;
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typedef short int16;
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typedef int int32;
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typedef char int8;
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// make sure these types have the right sizes on this platform
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COMPILE_TIME_ASSERT(sizeof(uint8) == 1);
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COMPILE_TIME_ASSERT(sizeof(uint16) == 2);
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COMPILE_TIME_ASSERT(sizeof(uint32) == 4);
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COMPILE_TIME_ASSERT(sizeof(uint64) == 8);
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COMPILE_TIME_ASSERT(sizeof(int8) == 1);
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COMPILE_TIME_ASSERT(sizeof(int16) == 2);
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COMPILE_TIME_ASSERT(sizeof(int32) == 4);
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COMPILE_TIME_ASSERT(sizeof(int64) == 8);
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template <typename T, size_t s = sizeof(T)>
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struct unsigned_type;
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template <typename T>
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struct unsigned_type<T,1> { typedef uint8 type; };
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template <typename T>
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struct unsigned_type<T,2> { typedef uint16 type; };
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template <typename T>
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struct unsigned_type<T,4> { typedef uint32 type; };
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template <typename T>
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struct unsigned_type<T,8> { typedef uint64 type; };
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/*!
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ensures
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- sizeof(unsigned_type<T>::type) == sizeof(T)
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- unsigned_type<T>::type is an unsigned integral type
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!*/
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template <typename T, typename U>
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T zero_extend_cast(
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const U val
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)
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/*!
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requires
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- U and T are integral types
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ensures
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- let ut be a typedef for unsigned_type<U>::type
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- return static_cast<T>(static_cast<ut>(val));
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!*/
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{
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typedef typename unsigned_type<U>::type ut;
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return static_cast<T>(static_cast<ut>(val));
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}
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}
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#endif // DLIB_UINtn_
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