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std::strstream::~strstream

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< cpp‎ | io‎ | strstream
Revision as of 07:19, 15 August 2013 by P12 (Talk | contribs)

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virtual ~strstream();

Destroys a std::strstream object, which also destroys the member std::strstreambuf, which may call the deallocation function if the underlying buffer was dynamically-allocated and not frozen.

[edit] Parameters

(none)

[edit] Notes

If str() was called on a dynamic strstream and freeze(false) was not called after that, this destructor leaks memory.

[edit] Example

#include <strstream>
#include <iostream>
 
int main()
{
    {
        std::ostrstream s; // dynamic buffer 
        s << 1.23;
        std::cout << s.str() << '\n';
        s.freeze(false);
    } // destructor called, buffer deallocated 
 
    {
        std::ostrstream s;
        s << 1.23;
        std::cout << s.str() << '\n';
//        buf.freeze(false);
    } // destructor called, memory leaked
 
    {
        std::istrstream s("1.23"); // constant buffer
        double d;
        s >> d;
        std::cout << d << '\n';
    } // destructor called, nothing to deallocate
}

Output:

1.23
1.23
1.23