std::strstreambuf::~strstreambuf
From cppreference.com
virtual ~strstreambuf();
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(deprecated in C++98) (removed in C++26) |
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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 <iostream>
#include <strstream>
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
