< cpp‎ | io‎ | ostrstream
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void freeze(bool flag = true);

If the stream is using a dynamically-allocated array for output, disables (flag == true) or enables (flag == false) automatic allocation/deallocation of the buffer. Effectively calls rdbuf()->pcount()


[edit] Notes

After a call to str(), dynamic streams become frozen automatically. A call to freeze(false) is required before exiting the scope in which this ostrstream object was created. otherwise the destructor will leak memory. Also, additional output to a frozen stream may be truncated once it reaches the end of the allocated buffer.

[edit] Parameters

flag - desired status

[edit] Return value


[edit] Example

#include <strstream>
#include <iostream>
int main()
    std::ostrstream dyn; // dynamically-allocated output buffer
    dyn << "Test: " << 1.23;
    std::cout << "The output stream contains \"" << dyn.str() << "\"\n";
    dyn << "Test: " << 1.23;
    std::cout << "The output stream contains \"" << dyn.str() << "\"\n";
    // the stream is now frozen due to str()
    dyn << " More text";
    std::cout << "The output stream contains \"" << dyn.str() << "\"\n";

Possible output:

The output stream contains "Test: 1.23"
The output stream contains "Test: 1.23 More "

[edit] See also

sets/clears the frozen state of the buffer
(public member function of std::strstreambuf) [edit]