Env indexing

[Tomhet]

what "::var" good for?
is that good for direct index to the global env?
then is this faster when I use in a deep local place?

#include<stdio.h>

const char*hue="hue";

int main(){
  {{{{{{{{{{
    int var2(1);
    puts(::hue);
  }}}}}}}}}}
  return 0;
};

[MikeyBoy]

"::var" simply specifies that you want to use the "var" that is in the global namespace, rather than any entity with the same name in a different namespace. Consider:

int var = 10;   // Global variable

namespace myNameSpace
{
int var = 5;
}

namespace myNameSpace
{

int main()
{
  std::cout << ::var << std::endl;  // Outputs "10"
  std::cout << myNameSpace::var << std::endl;  // Outputs "5"
  std::cout << var << std::endl;  // COMPILER ERROR - var is ambiguous
}

}

I don't think there's any performance improvement using ::var - it simply disambiguates the name.

[Tomhet]

hmm I guessed well in my mind...
thanks