Re: global variables - an alternate approach
On Feb 13, 6:24 pm, "Martin B." <0xCDCDC...@gmx.at> wrote:
You did *not* define global variables, but global constants.
OK! I'll buy that.
In you case I would do:
namespace my_consts {
static int const a = 5;
static double const pi = 3.141;
}
True but of course - if memory serves - this violates the ODR rule.
Every translation unit that include either (common_data_a.h or
common_data_b.h) file will get a/their own copy of 'a' and 'PI'
The singleton approach makes sense when your global object (be it a
const or a variable) should only be constructed if used:
class MyConsts {
const LargeInteger a;
const RealNumber pi;
MyConsts()
: a("5000100200300400500600700800900")
, pi("3.14159265358979323846264338327950288")
{ }
public:
MyConsts const& instance() {
// Threading issues aside, this will only call the ctor of MyConsts
// the first time instance() is called:
static MyConsts obj;
return obj;
}
};
Agreed!
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