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) |
Constructs new istrstream and its underlying std::strstreambuf.
1,2) Constructs the underlying
std::strstreambuf by calling strstreambuf(s,0) and initializes the base class with the address of the strstreambuf. The behavior is undefined if s is not pointing at an element of a null-terminated array. 3,4) Constructs the underlying
std::strstreambuf by calling strstreambuf(s,n) and initializes the base class with the address of the strstreambuf. The behavior is undefined if s is not pointing at an element of an array whose length is at least n elements.Parameters
| s | - | C-string or char array to use as the contents of the stream |
| n | - | size of the array |
Example
#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';
}Output:
1, 2, 3 4, 5, 6
See also
| constructs a strstreambuf object (public member function of std::strstreambuf) | |
| constructs an strstream, optionally allocating the buffer (public member function of std::ostrstream) | |
| constructs an strstream, optionally allocating the buffer (public member function of std::strstream) |
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