std::strstream::~strstream

 

C++

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Feature test macros (C++20)

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Technical specifications

Symbols index

External libraries

 

Input/output library

I/O manipulators

Print functions (C++23)

C-style I/O

Buffers

basic_streambuf

basic_filebuf

basic_stringbuf

basic_spanbuf (C++23)

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Synchronized Output

basic_osyncstream (C++20)

Types

streamoff

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Error category interface

iostream_category (C++11)

io_errc (C++11)

 

std::strstream

Member functions

strstream::strstream

strstream::~strstream

strstream::rdbuf

strstream::str

strstream::pcount

strstream::freeze

 

virtual ~strstream();		(deprecated in C++98) (removed in C++26)

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.

Parameters

(none)

Notes

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

Example

Run this code

#include <iostream>
#include <strstream>
 
int main()
{
    {
        std::ostrstream s; // dynamic buffer 
        s << 1.23 << std::ends;
        std::cout << s.str() << '\n';
        s.freeze(false);
    } // destructor called, buffer deallocated 
 
    {
        std::ostrstream s;
        s << 1.23 << std::ends;
        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