c++中比static結構體更好用的namespace

經驗證 struct 中包含static情況下，可以用

namespace tao{
   int hai;
}

來替換 。應用時只需要：tao::hai.

 
#ifndef _MY_HPP_
#define _MY_HPP_

namespace myns{
    int x = 100;
}

void fun();

#endif
 

I want to define an structure, where some math constants would be stored.
Here what I've got now:

struct consts {
    //salt density kg/m3
   static const double gamma;
};

const double consts::gamma = 2350;

It works fine, but there would be more than 10 floating point constants, so I doesn't want to wrote 'static const' before each of them. And define something like that:

static const struct consts {
    //salt density kg/m3
   double gamma;
};

const double consts::gamma = 2350;

It look fine, but I got these errors:
1. member function redeclaration not allowed
2. a nonstatic data member may not be defined outside its class

I wondering if there any C++ way to do it?

Use a namespace rather than trying to make a struct into a namespace.

namespace consts{
    const double gamma = 2350;
}

The method of accessing the data also has exactly the same synatx. So for example:

double delta = 3 * consts::gamma;