helper.hpp

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/*
    Copyright (c) 2011-2014 University of Zurich
    
    Permission is hereby granted, free of charge, to any person obtaining a copy
    of this software and associated documentation files (the "Software"), to deal
    in the Software without restriction, including without limitation the rights
    to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
    copies of the Software, and to permit persons to whom the Software is
    furnished to do so, subject to the following conditions:
    
    The above copyright notice and this permission notice shall be included in
    all copies or substantial portions of the Software.
    
    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    THE SOFTWARE.
*/

#ifndef PLLL_INCLUDE_GUARD__HELPER_HPP
#define PLLL_INCLUDE_GUARD__HELPER_HPP

#include <plll/config.hpp>

namespace plll
{
    namespace helper
    {
        namespace implementation
        {
            template<bool no_error> struct CompileTimeError;
            template<> struct CompileTimeError<true> {};
        }
        
#if __cplusplus >= 201103L
        #define PLLL_INTERNAL_STATIC_CHECK(condition, IdentifierWhichIsAMessage) \
            static_assert(condition, #IdentifierWhichIsAMessage);
#else
        #define PLLL_INTERNAL_STATIC_CHECK(condition, IdentifierWhichIsAMessage) \
            { plll::helper::implementation::CompileTimeError<((condition) != 0)> ERROR_##IdentifierWhichIsAMessage; (void)ERROR_##IdentifierWhichIsAMessage; }
#endif
        
        namespace implementation
        {
            template<bool cond, typename A, typename B>
            class select_first_type_impl
            {
            public:
                typedef A result;
            };
            
            template<typename A, typename B>
            class select_first_type_impl<false, A, B>
            {
            public:
                typedef B result;
            };
        }
        
        template<bool cond, typename A, typename B>
        class SelectFirstType
        {
        public:
            typedef typename implementation::select_first_type_impl<cond, A, B>::result result;
        };
        
        namespace implementation
        {
            template<typename A, typename B>
            struct type_equality
            {
                enum { result = false };
            };
            
            template<typename A>
            struct type_equality<A, A>
            {
                enum { result = true };
            };
        }
        
        template<typename A, typename B>
        class CompareTypes
        {
        public:
            enum { equal = implementation::type_equality<A, B>::result, not_equal = !implementation::type_equality<A, B>::result };
        };
        
        namespace implementation
        {
            template<bool cond, typename T>
            class enable_if_impl
            {
            public:
            };
            
            template<typename T>
            class enable_if_impl<true, T>
            {
            public:
            };
        }
        
        template<bool cond, typename Type = void>
        class EnableIf
        {
        public:
            typedef typename implementation::enable_if_impl<cond, Type>::result result;
        };
        
        template<int val>
        struct IntToType
        {
            enum { value = val }; 
        };
        
        template<bool val>
        struct BoolToType
        {
            enum { value = val }; 
        };
        
        namespace implementation
        {
            template<typename A>
            struct remove_decorations_impl
            {
                typedef A result; 
            };
            
            template<typename A>
            struct remove_decorations_impl<volatile A>
            {
                typedef typename remove_decorations_impl<A>::result result;
            };
            
            template<typename A>
            struct remove_decorations_impl<const A>
            {
                typedef typename remove_decorations_impl<A>::result result;
            };
            
            template<typename A>
            struct remove_decorations_impl<A &>
            {
                typedef typename remove_decorations_impl<A>::result result;
            };
            
#if __cplusplus >= 201103L
            template<typename A>
            struct remove_decorations_impl<A &&>
            {
                typedef typename remove_decorations_impl<A>::result result;
            };
#endif
        }
        
        template<typename A>
        struct remove_decorations
        {
            typedef typename implementation::remove_decorations_impl<A>::result Result;
        };
        
        template<typename T>
        T & make_type_lvalue() PLLL_INTERNAL_NOTHROW_POSTFIX_ENFORCE;
    }
}

#endif