【简单的trim函数实现 | C++ 17】

#include <algorithm>
#include <string_view>
#include <string>

constexpr std::string_view trim(std::string_view s) noexcept{
	using namespace std::literals::string_literals;
	constexpr auto white_spaces { "\f\n\r\v\t "sv };
	auto first { s.find_first_not_of(white_spaces) };
	auto last  { s.find_last_not_of(white_spaces) + 1 };
	return s.substr(first, last);
}