62 lines
1.4 KiB
C++
62 lines
1.4 KiB
C++
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// Copyright 2020 Peter Dimov
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// Distributed under the Boost Software License, Version 1.0.
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// https://www.boost.org/LICENSE_1_0.txt
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#include <boost/describe.hpp>
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#include <boost/mp11.hpp>
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#include <stdexcept>
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#include <typeinfo>
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#include <string>
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#include <cstring>
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[[noreturn]] void throw_invalid_name( char const * name, char const * type )
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{
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throw std::runtime_error(
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std::string( "Invalid enumerator name '" ) + name
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+ "' for enum type '" + type + "'" );
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}
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template<class E> E string_to_enum( char const * name )
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{
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bool found = false;
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E r = {};
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boost::mp11::mp_for_each< boost::describe::describe_enumerators<E> >([&](auto D){
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if( !found && std::strcmp( D.name, name ) == 0 )
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{
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found = true;
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r = D.value;
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}
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});
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if( found )
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{
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return r;
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}
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else
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{
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throw_invalid_name( name, typeid( E ).name() );
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}
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}
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#include <iostream>
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BOOST_DEFINE_ENUM(E, v1, v2, v3)
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int main()
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{
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try
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{
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std::cout << "v1: " << string_to_enum<E>( "v1" ) << std::endl;
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std::cout << "v2: " << string_to_enum<E>( "v2" ) << std::endl;
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std::cout << "v3: " << string_to_enum<E>( "v3" ) << std::endl;
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std::cout << "v4: " << string_to_enum<E>( "v4" ) << std::endl;
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}
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catch( std::exception const & x )
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{
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std::cout << x.what() << std::endl;
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}
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}
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