std::strstreambuf::~strstreambuf
From cppreference.com
< cpp | io | strstreambuf
| 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.
[edit] Parameters
(none0
[edit] 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.
[edit] 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::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::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
