boolean.hpp

/*
 * live_cells_cpp
 * Copyright (C) 2024  Alexander Gutev <alex.gutev@gmail.com>
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you
 * may not use this file except in compliance with the License.  You
 * may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
 * implied.  See the License for the specific language governing
 * permissions and limitations under the License.
 */
 
#ifndef LIVE_CELLS_BOOLEAN_HPP
#define LIVE_CELLS_BOOLEAN_HPP
 
#include "observable.hpp"
#include "constant_cell.hpp"
#include "computed.hpp"
#include "store_cell.hpp"
 
namespace live_cells {
    template <typename A, typename B>
    auto operator && (const A &a, const B &b) requires (
        (Cell<A> && CellOrValue<B>) ||
        (CellOrValue<A> && Cell<B>)
    ) {
        return make_compute_cell([=] () {
            return ensure_cell(a).value() && ensure_cell(b).value();
        }, ensure_cell(a), ensure_cell(b));
    }
 
    template <typename A, typename B>
    auto operator || (const A &a, const B &b) requires (
        (Cell<A> && CellOrValue<B>) ||
        (CellOrValue<A> && Cell<B>)
    ) {
        return make_compute_cell([=] () {
            return a.value() || b.value();
        }, ensure_cell(a), ensure_cell(b));
    }
 
    auto operator ! (const Cell auto &cell) {
        return computed(cell, [] (auto value) {
            return !value;
        });
    }
 
    auto select(Cell auto condition, Cell auto if_true, Cell auto if_false) {
        return make_compute_cell([=] () {
            return condition.value() ? if_true.value() : if_false.value();
        }, condition, if_true, if_false);
    }
 
    auto select(Cell auto condition, Cell auto if_true) {
        return store(
            make_compute_cell([=] () {
                if (!condition.value()) {
                    none();
                }
 
                return if_true.value();
            }, condition, if_true)
        );
    }
 
    namespace ops {
 
        auto select(const Cell auto &if_true) {
            return [&] (const Cell auto &cond) {
                return live_cells::select(cond, if_true);
            };
        }
 
        auto select(const Cell auto &if_true, const Cell auto &if_false) {
            return [&] (const Cell auto &cond) {
                return live_cells::select(cond, if_true, if_false);
            };
        }
 
    }  // ops
 
}  // live_cells
 
#endif /* LIVE_CELLS_BOOLEAN_HPP */