std::literals::string_view_literals::operator""sv
Defined in header <string_view> | | |
|---|---|---|
constexpr string_view operator "" sv(const char* str, size_t len) noexcept; | (1) | (since C++17) |
constexpr u16string_view operator "" sv(const char16_t* str, size_t len) noexcept; | (2) | (since C++17) |
constexpr u32string_view operator "" sv(const char32_t* str, size_t len) noexcept; | (3) | (since C++17) |
constexpr wstring_view operator "" sv(const wchar_t* str, size_t len) noexcept; | (4) | (since C++17) |
形成字符文字的字符串视图。
1%29std::string_view{str, len}
2%29std::u16string_view{str, len}
3%29std::u32string_view{str, len}
4%29std::wstring_view{str, len}
参数
str | - | pointer to the beginning of the raw character array literal |
|---|---|---|
len | - | length of the raw character array literal |
返回值
弦[医]查看文字。
注记
这些运算符在命名空间中声明。std::literals::string_view_literals，两者都是literals和string_view_literals是内联命名空间。可以通过以下方式访问这些操作员using namespace std::literals，，，using namespace std::string_view_literals，和using namespace std::literals::string_view_literals...
例
二次
#include <string_view>
#include <iostream>
int main()
{
using namespace std::literals;
std::string_view s1 = "abc\0\0def";
std::string_view s2 = "abc\0\0def"sv;
std::cout << "s1: " << s1.size() << " \"" << s1 << "\"\n";
std::cout << "s2: " << s2.size() << " \"" << s2 << "\"\n";
}二次
可能的产出：
二次
s1: 3 "abc"
s2: 8 "abc^@^@def"二次
另见
(constructor) | constructs a basic_string_view (public member function) |
|---|
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