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// Copyright (c) 2014-2017 Dr. Colin Hirsch and Daniel Frey
// Please see LICENSE for license or visit https://github.com/taocpp/PEGTL/
#ifndef TAOCPP_PEGTL_INCLUDE_ANALYSIS_INSERT_GUARD_HPP
#define TAOCPP_PEGTL_INCLUDE_ANALYSIS_INSERT_GUARD_HPP
#include <utility>
#include "../config.hpp"
namespace tao
{
namespace TAOCPP_PEGTL_NAMESPACE
{
namespace analysis
{
template< typename C >
class insert_guard
{
public:
insert_guard( insert_guard&& other ) noexcept
: m_i( other.m_i ),
m_c( other.m_c )
{
other.m_c = nullptr;
}
insert_guard( C& container, const typename C::value_type& value )
: m_i( container.insert( value ) ),
m_c( &container )
{
}
~insert_guard()
{
if( m_c && m_i.second ) {
m_c->erase( m_i.first );
}
}
insert_guard( const insert_guard& ) = delete;
void operator=( const insert_guard& ) = delete;
explicit operator bool() const noexcept
{
return m_i.second;
}
private:
const std::pair< typename C::iterator, bool > m_i;
C* m_c;
};
template< typename C >
insert_guard< C > make_insert_guard( C& container, const typename C::value_type& value )
{
return insert_guard< C >( container, value );
}
} // namespace analysis
} // namespace TAOCPP_PEGTL_NAMESPACE
} // namespace tao
#endif
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