std::istrstream::istrstream
From cppreference.com
< cpp | io | 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) | |
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.[edit] Parameters
| s | - | C-string or char array to use as the contents of the stream |
| n | - | size of the array |
[edit] Example
Run this code
#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
[edit] 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)
|
