/homes/esi30/DCS339/coursework/src/utils.hpp

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#ifndef UTILS_HPP_INCLUDED
#define UTILS_HPP_INCLUDED

#include <stdexcept>
#include <type_traits>

extern const char *cmake_install_prefix;

void register_processings();

template<class T>
struct Singleton{
    Singleton() {
        if(!std::is_base_of<Singleton<T>, T>::value)
            throw std::runtime_error("Instanciation of a type inheriting from Singleton without itself as template parameter");
        static bool first=true;
        if(!first || (first=!first))
            throw std::runtime_error("Trying to construct more than one singleton");
    }
};

#endif