[cbsmith]

It's not constructors per se. It's what people put in to them. So MyType t also allocates in C, right (it'd be a stack allocation of sizeof(MyType) bytes)? But the difference is in C++ that could cause a bazillion heap allocations.

The problem gets magnified when you pass around these objects by value, thereby invoking copy constructors that also do those allocations, and doing value assignment, where you could have all those allocations happen again.

His comments predate r-value references, and a lot of stuff that r-value references have improved would be exactly the kinds of things where he saw a problem (though he'd hate the r-value solution).