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Add a signed integer ceiling divide function

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krcroft 2020-03-05 16:51:53 -08:00 • committed by Patryk Obara
parent be643d66b1
commit 08c6fc10c1
5 changed files with 31 additions and 18 deletions
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13
include/support.h
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@ -38,15 +38,22 @@
// Works with both \ and / directory delimeters.
std::string get_basename(const std::string& filename);
// Unsigned integer division with ceiling
// There is no risk of signed types being used here because the template is unsigned
// Unsigned-only integer division with ceiling
template<typename T1, class = typename std::enable_if<std::is_unsigned<T1>::value>::type,
typename T2, class = typename std::enable_if<std::is_unsigned<T2>::value>::type>
inline const T1 ceil_divide(const T1 x, const T2 y) noexcept {
inline const T1 ceil_udivide(const T1 x, const T2 y) noexcept {
return (x != 0) ? 1 + ((x - 1) / y) : 0;
// https://stackoverflow.com/a/2745086
}
// Signed-only integer division with ceiling
template<typename T1, class = typename std::enable_if<std::is_signed<T1>::value>::type,
typename T2, class = typename std::enable_if<std::is_signed<T2>::value>::type>
inline const T1 ceil_sdivide(const T1 x, const T2 y) noexcept {
return x / y + (((x < 0) ^ (y > 0)) && (x % y));
// https://stackoverflow.com/a/33790603
}
// Include a message in assert, similar to static_assert:
#define assertm(exp, msg) assert(((void)msg, exp))
// Use (void) to silent unused warnings.