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mingkuang
38 lines
996 B
C++
38 lines
996 B
C++
//
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// difftime.cpp
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//
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// Copyright (c) Microsoft Corporation. All rights reserved.
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//
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// The difftime() family of functions, which compute the difference between time
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// values.
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//
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#include <corecrt_internal_time.h>
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// Computes the difference between two times (b - a). Returns a double with the
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// difference in seconds between the two times. Returns zero if the input is
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// invalid.
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template <typename TimeType>
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static double __cdecl common_difftime(TimeType const b, TimeType const a) throw()
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{
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_VALIDATE_RETURN_NOEXC(a >= 0 && b >= 0, EINVAL, 0);
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return static_cast<double>(b - a);
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}
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#if WindowsTargetPlatformMinVersion < WindowsTargetPlatformWindows6
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extern "C" double __cdecl _difftime32(__time32_t const b, __time32_t const a)
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{
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return common_difftime(b, a);
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}
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_LCRT_DEFINE_IAT_SYMBOL(_difftime32);
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extern "C" double __cdecl _difftime64(__time64_t const b, __time64_t const a)
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{
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return common_difftime(b, a);
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}
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_LCRT_DEFINE_IAT_SYMBOL(_difftime64);
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#endif |