type_traits.h

#ifndef PROBFD_CALL_TRAITS_H
#define PROBFD_CALL_TRAITS_H
 
#include <type_traits>
 
// Forward Declarations
class OperatorID;
 
namespace probfd {
 
template <typename T>
struct is_cheap_to_copy : public std::bool_constant<std::is_scalar_v<T>> {};
 
template <>
struct is_cheap_to_copy<OperatorID> : public std::true_type {};
 
template <typename T>
static constexpr bool is_cheap_to_copy_v = is_cheap_to_copy<T>::value;
 
template <typename T>
using param_type =
    typename std::conditional_t<is_cheap_to_copy_v<T>, T, const T&>;
 
} // namespace probfd
 
#endif // PROBFD_CALL_TRAITS_H