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std::basic_istringstream<CharT,Traits,Allocator>:: view

From cppreference.net

C++
Input/output library
std::basic_istringstream
std:: basic_string_view < CharT, Traits > view ( ) const noexcept ;
(C++20 起)

获取底层字符串对象的 std::basic_string_view 。等效于 return rdbuf ( ) - > view ( ) ; 。

目录

参数

(无)

返回值

一个针对底层字符串对象的 std::basic_string_view 视图。

示例

运行此代码 
#include <iostream>
#include <sstream>
int main()
{
    // 输入/输出流
    std::stringstream buf1;
    buf1 << 69;
    int n = 0;
    buf1 >> n;
    std::cout << "1) buf1 = [" << buf1.view() << "], n = " << n << '\n';
    // 追加模式的输出流
    std::ostringstream buf2("test", std::ios_base::ate);
    buf2 << '1';
    std::cout << "2) buf2 = [" << buf2.view() << "]\n";
    // 输入流
    std::istringstream inbuf("-42");
    inbuf >> n;
    std::cout << "3) inbuf = [" << inbuf.view() << "], n = " << n << '\n';
}

输出： 

1) buf1 = [69], n = 69
2) buf2 = [test1]
3) inbuf = [-42], n = -42

参见

(C++20)
获取底层字符序列的视图
( std::basic_stringbuf<CharT,Traits,Allocator> 的公开成员函数)