std::istrstream::istrstream
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< cpp | io | istrstream
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(C++11)
explicit istrstream( const char* s );
(1)
(deprecated in C++98) (removed in C++26)
explicit istrstream( char* s );
(2)
(deprecated in C++98) (removed in C++26)
Constructs new std::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 an
(public member function of
ostrstream object, optionally allocating the buffer (public member function of
std::ostrstream) [edit]
constructs a
(public member function of
strstream object, optionally allocating the buffer (public member function of
std::strstream) [edit]