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Contents
// Copyright (c) 2014-2022 Dr. Colin Hirsch and Daniel Frey
// Please see LICENSE for license or visit https://github.com/taocpp/PEGTL/
#ifndef TAO_PEGTL_INTERNAL_IF_MUST_HPP
#define TAO_PEGTL_INTERNAL_IF_MUST_HPP
#if !defined( __cpp_exceptions )
#error "Exception support required for tao/pegtl/internal/if_must.hpp"
#else
#include "../config.hpp"
#include "enable_control.hpp"
#include "must.hpp"
#include "../apply_mode.hpp"
#include "../rewind_mode.hpp"
#include "../type_list.hpp"
namespace TAO_PEGTL_NAMESPACE::internal
{
template< bool Default, typename Cond, typename... Rules >
struct if_must
{
using rule_t = if_must;
using subs_t = type_list< Cond, must< Rules... > >;
template< apply_mode A,
rewind_mode M,
template< typename... >
class Action,
template< typename... >
class Control,
typename ParseInput,
typename... States >
[[nodiscard]] static bool match( ParseInput& in, States&&... st )
{
if( Control< Cond >::template match< A, M, Action, Control >( in, st... ) ) {
(void)Control< must< Rules... > >::template match< A, M, Action, Control >( in, st... );
return true;
}
return Default;
}
};
template< bool Default, typename Cond, typename... Rules >
inline constexpr bool enable_control< if_must< Default, Cond, Rules... > > = false;
} // namespace TAO_PEGTL_NAMESPACE::internal
#endif
#endif
Version data entries
11 entries across 11 versions & 1 rubygems