functions.hpp

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/*
 * Title:        bits/functions.hpp
 * Description:  C++ header-only wrapper for C-ABI data_t type
 * $Copyright (c) 2015-2017 Software AG, Darmstadt, Germany and/or Software AG USA Inc., Reston, VA, USA, and/or its subsidiaries and/or its affiliates and/or their licensors.$
 * Use, reproduction, transfer, publication or disclosure is prohibited except as specifically provided for in your License Agreement with Software AG
 * @Version:     $Id: functions.hpp 307731 2017-05-15 09:53:24Z matj $
 */

#ifndef _DATAT_BITS_INCLUDE_TAG
#error Must only be included from sag_connectivity_cpp.hpp, use that instead
#endif

#include <sag_internal/convert_to.hpp>

template<typename V>
inline typename V::result_type apply_visitor(const V&v, data_t& t) { return t.apply_visitor(v); }
template<typename V>
inline typename V::result_type apply_visitor(const V&v, const data_t& t) { return t.apply_visitor(v); }

template<typename T>
inline typename get_details::GetVisitor<const T>::result_type get(const data_t &t) { return apply_visitor(get_details::GetVisitor<const T>(), t); }
template<>
inline const data_t &get<const data_t&>(const data_t &t) { return t; }
template<typename T>
inline typename get_details::GetVisitor<T>::result_type get(data_t &t) { return apply_visitor(get_details::GetVisitor<T>(), t); }
template<>
inline data_t &get<data_t&>(data_t &t) { return t; }
template<typename T>
inline typename get_details::GetVisitor<custom_t<T> >::result_type get_custom(data_t &t) { return apply_visitor(get_details::GetVisitor<custom_t<T> >(), t); }
template<typename T>
inline typename get_details::GetVisitor<const custom_t<T> >::result_type get_custom(const data_t &t) { return apply_visitor(get_details::GetVisitor<const custom_t<T> >(), t); }

template<typename T>
inline T convert_to(const data_t &d) 
{
        // if you get an error like:
        // no match for call to '(const convert_to_details::_get_or_convert<TYPE>) ()'
        // then you're probably trying to use convert_to with an incorrect type. 
        // You can only use it for double, bool or int64_t.
        // For other types use get<TYPE>, but it won't parse it to/from a
        // string.
        return apply_visitor(convert_to_details::_get_or_convert<T>(d.type_name()), d);
}