NAME¶

std::strstreambuf::~strstreambuf - std::strstreambuf::~strstreambuf

Synopsis¶

virtual ~strstreambuf();

Destroys a std::strstreambuf object. if the object is managing a
dynamically-allocated buffer (the buffer state is "allocated") and if the object is
not frozen, then deallocates the buffer using the deallocation function provided at
construction or delete[] if none was provided.

Parameters¶

(none)

Notes¶

This destructor is typically called by the destructor of std::strstream

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>

void* my_alloc(size_t n)
{
std::cout << "my_alloc(" << n << ") called\n";
return new char[n];
}

void my_free(void* p)
{
std::cout << "my_free() called\n";
delete[] (char*)p;
}

int main()
{
{
std::strstreambuf buf(my_alloc, my_free);
std::ostream s(&buf);
s << 1.23 << std::ends;
std::cout << buf.str() << '\n';
buf.freeze(false);
} // destructor called here, buffer deallocated

{
std::strstreambuf buf(my_alloc, my_free);
std::ostream s(&buf);
s << 1.23 << std::ends;
std::cout << buf.str() << '\n';
// buf.freeze(false);
} // destructor called here, memory leak!
}

Output:¶

my_alloc(4096) called
1.23
my_free() called
my_alloc(4096) called
1.23