Is There Anything Like a Templatized Case-Statement

Question

So I have this really ugly code:

template 
std::conditional_t

        

Answer 1

As long as you understand the risk that the same sized type may not be the convertible, you could simply plugin a mpl::map..

typedef map<
      pair, char>,
      pair, short>,
      pair, int>,
      pair, long long>
    > m;

e.g.

#include 
#include 

#include 
#include 

using namespace boost::mpl;

typedef map<
      pair, char>,
      pair, short>,
      pair, int>,
      pair, long long>
    > m;

template 
typename at>::type foo(T bar)
{ return reinterpret_cast(bar); }


struct doh
{
    std::string a, b, c;
};

int main()
{
    {
      char c;
      static_assert(std::is_same::value, "error");
    }
    {
      short c;
      static_assert(std::is_same::value, "error");
    }
    {
      int c;
      static_assert(std::is_same::value, "error");
    }
    {
      long long c;
      static_assert(std::is_same::value, "error");
    }
    {
      double c;
      static_assert(std::is_same::value, "error");
    }    
    {
      doh c;
      static_assert(std::is_same::value, "error");
    }    
}