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Optimized Date::to_string for successive calls

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This commit is contained in:
eidheim 2019-07-31 21:38:35 +02:00
commit ac7cc6ef01
1 changed files with 9 additions and 0 deletions
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9
utility.hpp
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@ -322,6 +322,14 @@ namespace SimpleWeb {
/// Returns the given std::chrono::system_clock::time_point as a string with the following format: Wed, 31 Jul 2019 11:34:23 GMT. /// Returns the given std::chrono::system_clock::time_point as a string with the following format: Wed, 31 Jul 2019 11:34:23 GMT.
/// Warning: this function uses std::gmtime and is thus not thread safe. /// Warning: this function uses std::gmtime and is thus not thread safe.
static std::string to_string(const std::chrono::system_clock::time_point time_point) noexcept { static std::string to_string(const std::chrono::system_clock::time_point time_point) noexcept {
static std::string result_cache;
static std::chrono::system_clock::time_point last_time_point;
if(std::chrono::duration_cast<std::chrono::seconds>(time_point - last_time_point).count() == 0 && !result_cache.empty())
return result_cache;
last_time_point = time_point;
std::string result; std::string result;
result.reserve(29); result.reserve(29);
@ -376,6 +384,7 @@ namespace SimpleWeb {
result += " GMT"; result += " GMT";
result_cache = result;
return result; return result;
} }
}; };