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1//
2// difftime.cpp
3//
4// Copyright (c) Microsoft Corporation. All rights reserved.
5//
6// The difftime() family of functions, which compute the difference between time
7// values.
8//
9#include <corecrt_internal_time.h>
10
11
12
13// Computes the difference between two times (b - a). Returns a double with the
14// difference in seconds between the two times. Returns zero if the input is
15// invalid.
16template <typename TimeType>
17static double __cdecl common_difftime(TimeType const b, TimeType const a) throw()
18{
19 _VALIDATE_RETURN_NOEXC(a >= 0 && b >= 0, EINVAL, 0);
20
21 return static_cast<double>(b - a);
22}
23
24extern "C" double __cdecl _difftime32(__time32_t const b, __time32_t const a)
25{
26 return common_difftime(b, a);
27}
28
29extern "C" double __cdecl _difftime64(__time64_t const b, __time64_t const a)
30{
31 return common_difftime(b, a);
32}