std::istrstream::istrstream

explicit istrstream(const char* s);	(1)
explicit istrstream(char* s);	(2)
istrstream(const char* s, std::streamsize n);	(3)
istrstream(char* s, std::streamsize n);	(4)

构造新的StStream及其基础std::strstreambuf...

1，2%29构造基础std::strstreambuf打电话strstreambuf(s,0)并使用strStrebuf的地址初始化基类。如果s不是指向以空结尾的数组的元素。

3，4%29构造基础std::strstreambuf打电话strstreambuf(s,n)并使用strStrebuf的地址初始化基类。如果s不是指向至少长度为n元素。

参数

s	-	C-string or char array to use as the contents of the stream
n	-	size of the array

例

二次

#include <iostream>
#include <strstream>
 
int main()
{
    std::istrstream s1("1 2 3"); // string literal
    int n1,n2,n3;
    if(s1 >> n1 >> n2 >> n3)
        std::cout << n1 << ", " << n2 << ", " << n3 << '\n';
 
    char arr[] = {'4', ' ', '5', ' ', '6'};
    std::istrstream s2(arr, sizeof arr);
    if(s2 >> n1 >> n2 >> n3)
        std::cout << n1 << ", " << n2 << ", " << n3 << '\n';
}

二次

产出：

二次

1, 2, 3
4, 5, 6

二次

另见

(constructor)	constructs a strstreambuf object (public member function of std::strstreambuf)
(constructor)	constructs an strstream, optionally allocating the buffer (public member function of std::ostrstream)
(constructor)	constructs an strstream, optionally allocating the buffer (public member function of std::strstream)

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最后更新于：2017-12-18