ext-boost/boost/intrusive/detail/array_initializer.hpp

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2016-03-02 05:27:27 +00:00
/////////////////////////////////////////////////////////////////////////////
//
// (C) Copyright Ion Gaztanaga 2014-2014
//
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
// See http://www.boost.org/libs/intrusive for documentation.
//
/////////////////////////////////////////////////////////////////////////////
#ifndef BOOST_INTRUSIVE_DETAIL_ARRAY_INITIALIZER_HPP
#define BOOST_INTRUSIVE_DETAIL_ARRAY_INITIALIZER_HPP
#ifndef BOOST_CONFIG_HPP
# include <boost/config.hpp>
#endif
#if defined(BOOST_HAS_PRAGMA_ONCE)
# pragma once
#endif
#include <boost/config.hpp>
#include <boost/core/no_exceptions_support.hpp>
namespace boost {
namespace intrusive {
namespace detail {
//This is not standard, but should work with all compilers
union max_align
{
char char_;
short short_;
int int_;
long long_;
#ifdef BOOST_HAS_LONG_LONG
::boost::long_long_type long_long_;
#endif
float float_;
double double_;
long double long_double_;
void * void_ptr_;
};
template<class T, std::size_t N>
class array_initializer
{
public:
template<class CommonInitializer>
array_initializer(const CommonInitializer &init)
{
char *init_buf = (char*)rawbuf;
std::size_t i = 0;
BOOST_TRY{
for(; i != N; ++i){
new(init_buf)T(init);
init_buf += sizeof(T);
}
}
BOOST_CATCH(...){
while(i--){
init_buf -= sizeof(T);
((T*)init_buf)->~T();
}
BOOST_RETHROW;
}
BOOST_CATCH_END
}
operator T* ()
{ return (T*)(rawbuf); }
operator const T*() const
{ return (const T*)(rawbuf); }
~array_initializer()
{
char *init_buf = (char*)rawbuf + N*sizeof(T);
for(std::size_t i = 0; i != N; ++i){
init_buf -= sizeof(T);
((T*)init_buf)->~T();
}
}
private:
detail::max_align rawbuf[(N*sizeof(T)-1)/sizeof(detail::max_align)+1];
};
} //namespace detail{
} //namespace intrusive{
} //namespace boost{
#endif //BOOST_INTRUSIVE_DETAIL_ARRAY_INITIALIZER_HPP