enum class

[Chris Forone]

is it possible to use enum class as index in std::vector or
std::valarray without explicit conversation? ms vs express 2012 do not
compile something like:

enum class Coordinate : std::size_t { X, Y, Z };

std::valarray<float> position(3);
position[Coordinate::X] = 1.0f;

old style (without class) does!

thanks & greetings, chris

 

[Marcel Müller]

is it possible to use enum class as index in std::vector or
std::valarray without explicit conversation?

AFAIK there is no implicit conversion from enum class to int.

But you can write your own vector, deriving from std::vector (protected)
and exposing only the functions you like to keep while overwriting
others with strongly typed version using your enum as index.

enum class Coordinate : std::size_t { X, Y, Z };

std::valarray<float> position(3);
position[Coordinate::X] = 1.0f;

old style (without class) does!

Yes because there is an implicit conversion to int.

But you can still use old style enums, if you want to keep the
compatibility to not strongly typed methods.

class Coordinate
{ enum { X, Y, Z };
};


Marcel