conditional.h

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// This file is part of MARTY.
// 
// MARTY is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// 
// MARTY is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
// 
// You should have received a copy of the GNU General Public License
// along with MARTY. If not, see <https://www.gnu.org/licenses/>.

#ifndef CONDITIONAL_H_INCLUDED
#define CONDITIONAL_H_INCLUDED

#include <optional>
#include <functional>

namespace csl {

template<class ...Args>
class OptionalCondition {

    using cond_t = std::function<bool(Args...)>;

    public:

    OptionalCondition()
        :condition([]([[maybe_unused]]Args&& ...args) { return true; })
    {

    }

    OptionalCondition(std::optional<cond_t> t_condition)
        :condition(t_condition)
    {

    }

    operator bool() const 
    {
        return condition.operator bool();
    }

    bool operator()(Args ...args) const
    {
        if (not condition)
            return true;
        return condition.value()(args...);
    }

    private:

    std::optional<cond_t> condition;
};
} // End of namespace csl

#endif