errors.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_ERRORS_HPP
#define LIVE_CELLS_ERRORS_HPP
 
#include "observable.hpp"
#include "computed.hpp"
#include "store_cell.hpp"
 
namespace live_cells {
    auto on_error(const Cell auto &cell, const Cell auto &error_value) {
        return store(
            make_compute_cell([=] () {
                try {
                    return cell.value();
                }
                catch (...) {
                    return error_value.value();
                }
            }, cell, error_value)
        );
    }
 
    template <typename E>
    auto on_error(const Cell auto &cell, const Cell auto &error_value) {
        return store(
            make_compute_cell([=] () {
                try {
                    return cell.value();
                }
                catch (const E &) {
                    return error_value.value();
                }
            }, cell, error_value)
        );
    }
 
    namespace ops {
 
        auto on_error(const Cell auto &error_value) {
            return [&] (const Cell auto &cell) {
                return live_cells::on_error(cell, error_value);
            };
        }
 
        template <typename E>
        auto on_error(const Cell auto &error_value) {
            return [&] (const Cell auto &cell) {
                return live_cells::on_error<E>(cell, error_value);
            };
        }
 
    }  // operators
 
}  // live_cells
 
#endif /* LIVE_CELLS_ERRORS_HPP */