C++ Move Semantics Can Be Avoided Using Custom Memory Allocators

A technical breakdown explores the hidden performance cost of C++ move semantics, focusing on the overhead introduced by move constructors and destructors when inserting objects into containers like std::vector. When a temporary object is pushed into a vector, the compiler generates both a move constructor call and an extra destructor invocation, adding unnecessary overhead. To avoid this, the author demonstrates using a custom memory allocator that returns a raw pointer, bypassing C++ RAII and automatic stack restoration entirely. Storing a pointer instead of the full object means the vector holds only 8 bytes per entry and insertion requires just a single assembly instruction. The tradeoff is that developers must manually invoke destructors, since the compiler no longer handles memory cleanup automatically.