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.
}