Variadic template function for comparison with multiple values

variadic_isoneof.cpp

#include <iostream>
#include <cstdarg>

//IsOneOf(x, a, b, c) is an equivalent of (x == a || x == b || x == c)
template<typename T>
bool IsOneOf(const T& var, const T& val)
{
    return var == val;
}

template<typename T, typename... Args>
bool IsOneOf(const T& var, const T& val, const Args&... vals)
{
    return IsOneOf(var, val) || IsOneOf(var, vals...);
}

int main()
{
    std::cout << IsOneOf(1, 0, 1, 2, 3) << std::endl;  // 1
    std::cout << IsOneOf('a', 'd', 'e', 'f') << std::endl; // 0
    // std::cout << IsOneOf(true, 1, 0) << std::endl;  <-- Compilation error: deduced conflicting types ('bool' vs 'int')
    return 0;
}