std::strstreambuf::strstreambuf (3) Linux Manual Page
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: