IsBaseOf.h

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/*
 * This file is a part of the Biology project by eons LLC.
 * Biology (aka Develop Biology) is a framework for approaching software
 * development from a natural sciences perspective.
 *
 * Copyright (C) 2026 Séon O'Shannon & eons LLC
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
 
#pragma once
 
#if BIO_CPP_VERSION >= 11
 
    #include <type_traits>
 
#endif
 
namespace bio {
namespace type {
 
template < typename BASE, typename DERIVED >
struct IsBaseOf
{
#if BIO_CPP_VERSION >= 11
    enum { Value = ::std::is_base_of< BASE, DERIVED >::value };
#else
private:
    typedef char Yes;
    struct No
    {
        char value[2];
    };
 
    static Yes Test(BASE*);
    static No Test(...);
    static DERIVED* DerivedPointer();
 
public:
    enum { Value = sizeof(Test(DerivedPointer())) == sizeof(Yes) };
#endif
};
 
} //type namespace
} //bio namespace