Custom memory allocators in C++ allow for more control over memory management. They can optimize allocation patterns specific to application needs. Custom allocators are useful for performance tuning and managing complex data structures.
Example of a custom allocator:
#include
#include
template
class MyAllocator : public std::allocator {
public:
T* allocate(size_t n) {
std::cout << "Allocating " << n << " elements." << std::endl;
return std::allocator::allocate(n);
}
void deallocate(T* p, size_t n) {
std::cout << "Deallocating " << n << " elements." << std::endl;
std::allocator::deallocate(p, n);
}
};
int main() {
std::vector> vec;
vec.push_back(10);
return 0;
}