std::ostrstream::~ostrstream

C++

Language

Headers

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Named requirements

Language support library

Concepts library (C++20)

Diagnostics library

Utilities library

Strings library

Containers library

Algorithms library

Iterators library

Numerics library

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Localizations library

Regular expressions library (C++11)

Atomic operations library (C++11)

Thread support library (C++11)

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Technical Specifications

Input/output library

I/O manipulators

C-style I/O

Buffers

basic_streambuf

basic_filebuf

basic_stringbuf

strstreambuf (deprecated)

basic_syncbuf (C++20)

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Abstractions

ios_base

basic_ios

basic_istream

basic_ostream

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basic_ifstream

basic_ofstream

basic_fstream

String I/O

basic_istringstream

basic_ostringstream

basic_stringstream

Array I/O

istrstream (deprecated)

ostrstream (deprecated)

strstream (deprecated)

Synchronized Output

basic_osyncstream (C++20)

Types

streamoff

streamsize

fpos

Error category interface

iostream_category (C++11)

io_errc (C++11)

std::ostrstream

Member functions

ostrstream::ostrstream

ostrstream::~ostrstream

ostrstream::rdbuf

ostrstream::str

ostrstream::freeze

ostrstream::pcount

virtual ~ostrstream();

Destroys a std::ostrstream 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 ostrstream and freeze(false) was not called after that, this destructor leaks memory.

Example

Run this code

#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
}

Output:

1.23
1.23