I'm not saying you shouldn't reuse allocated objects. I'm talking about building a local object (no dynamic allocation) and assigning it to the pointer at once. This has the same runtime behavior (assuming -O1) as assigning the fields one by one.

See https://godbolt.org/z/Wh5KcTaGY for what I'm talking about, the local allocation is easily eliminated by the compiler.

The equivalent in C is to create a temporary local variable with an initializer list then write that variable to the pointer.