std::strstream::~strstream

C++

Language

Headers

Freestanding and hosted implementations

Named requirements

Language support library

Concepts library (C++20)

Diagnostics library

Utilities library

Strings library

Containers library

Algorithms library

Iterators library

Numerics library

Input/output library

Localizations library

Regular expressions library (C++11)

Atomic operations library (C++11)

Thread support library (C++11)

Filesystem library (C++17)

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)

Streams

Abstractions

ios_base

basic_ios

basic_istream

basic_ostream

basic_iostream

File I/O

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::strstream

Member functions

strstream::strstream

strstream::~strstream

strstream::rdbuf

strstream::str

strstream::pcount

strstream::freeze

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.

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 <strstream>
#include <iostream>

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