class Foo {private: int a,b,c; float d; const char* e; double f;public: Foo();}Foo::Foo(): a(1), b(2), c(3), d(3.14159), e("Hello world"), d(1.0f){ //The compiler will probably put a single block of memory in the executable //containing all those elements in that order, and just copy the whole block //directly into the new object when you construct a Foo. When using //assignment inside the constructor, it would assign elements one by one. //The difference is *tiny*, but may matter on embedded processors. For //example, x86 CPUs would pipeline the instructions to assign the elements //and will be probably quite fast anyway.}