C++字符串后面的sv和s

sv和s可以使包含\0的字符串不截断，s是C++14新出的 sv是C++17新出的

想使用后缀sv和s的话 using namespace std::literals

函数原型如下

constexpr std::string_view operator "" sv( const char* str, std::size_t len ) noexcept;

如下例

#include

#include

int main()

{

using namespace std::string_literals;

std::string s1 = "abc\0\0def";

std::string s2 = "abc\0\0def"s;

std::cout << "s1: " << s1.size() << ' ' << s1 << '\n'

<< "s2: " << s2.size() << ' ' << s2 << '\n'

<< "abcdef"s.substr(1,4) << '\n';

}output:

s1: 3 abc

s2: 8 abc^@^@def

bcde参考 std::literals::string_literals::operator""s - cppreference.com