Initializer list in user-defined literal parameter

Question

I don\'t know if it\'s possible but I want to do stuff like

int someval = 1;
if({1,2,3,4}_v.contains(someval ))

but when I try to define l

Answer 1

How about this:

#include 

template 
bool contains(std::initializer_list const & il, T const & x)
{
    for (auto const & z : il) { if (z == x) return true; }
    return false;
}

Usage:

bool b = contains({1, 2, 3}, 5);  // false