Convert int64_t to double

Question

  int64_t a = 1234;

  double d = (double) a;

Is this the recommended way?

Answer 1

You can also use the conversion syntax, which is equivalent to a static_cast:

int64_t a = 1234;
double d = double(a);

This is a useful syntactic construction in that it allows primitive and class types to be treated the same way in template code, either doing a static_cast, for the primitive, or invoking a constructor, for the class type.