Memory is just one kind of resources. Games do tons of I/O, often gigabytes/second. To illustrate, any PC game has a lot of places which call GPU driver like th

Memory is just one kind of resources. Games do tons of I/O, often gigabytes/second. To illustrate, any PC game has a lot of places which call GPU driver like this: D3D11_MAPPED_SUBRESOURCE mapped; context->Map( buffer, 0, D3D11_MAP_WRITE_DISCARD, 0, &mapped ); // Write memory address pointed by mapped.pData context->Unmap( buffer, 0 ); With C++ RAII, you can do something like that instead: MappedBuffer mapped{ buffer } // Write memory address pointed by mapped.pData. // No need to do anything else, the destructor of MappedBuffer will unmap.