std::unordered_map default allocator

unordered_map_allocator.cpp

/**
 * std::unordered_map uses the default allocator.
 * Note: constexpr uint64_t MAP_SIZE = 1000000UL;
 */
void heapAlloc() {
    std::unordered_map<uint64_t, MyClass> alloc;

    for(uint64_t i = 0; i < MAP_SIZE; i++) {
        alloc.emplace(i, MyClass(i, i+3));
    }

    for(uint64_t i = 0; i < MAP_SIZE; i++) {
        alloc.erase(i);
        alloc.emplace(i, MyClass(i, i+3));
    }
}