constexpr_map.cpp

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/******************************************************************************
** Copyright © 2019 by J.M.McGuiness, coder@hussar.me.uk
**
** This library is free software; you can redistribute it and/or
** modify it under the terms of the GNU Lesser General Public
** License as published by the Free Software Foundation; either
** version 2.1 of the License, or (at your option) any later version.
**
** This library 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
** Lesser General Public License for more details.
**
** You should have received a copy of the GNU Lesser General Public
** License along with this library; if not, write to the Free Software
** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
 
#include "stdafx.h"
 
#define BOOST_TEST_MODULE libjmmcg_tests
#include <boost/test/included/unit_test.hpp>
 
#include "frozen/unordered_map.h"
 
using mapping_t=frozen::unordered_map<std::int16_t, char, 5>;
static constexpr mapping_t mapping={
   {1, '1'},
   {12, '1'},
   {42, '2'},
   {69, '3'},
   {667, '4'}
};
 
inline constexpr char
convert(std::int16_t v) noexcept(true) {
   const auto iter=mapping.find(v);
   if (iter!=mapping.end()) {
      return iter->second;
   } else {
      return '\0';
   }
}
 
BOOST_AUTO_TEST_SUITE(constexp_map)
 
BOOST_AUTO_TEST_CASE(lookup) {
   constexpr char a=convert(12);
   BOOST_CHECK_EQUAL(a, '1');
}
 
BOOST_AUTO_TEST_SUITE_END()