124 lines
3.2 KiB
C++
124 lines
3.2 KiB
C++
/* vim: set sw=4 sts=4 et foldmethod=syntax : */
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/*
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* Copyright (c) 2013 Wouter van Kesteren <woutershep@gmail.com>
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*
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* This file is part of the Paludis package manager. Paludis is free software;
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* you can redistribute it and/or modify it under the terms of the GNU General
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* Public License version 2, as published by the Free Software Foundation.
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*
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* Paludis is distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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* Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef PALUDIS_GUARD_PALUDIS_STREAM_HOLDER_HH
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#define PALUDIS_GUARD_PALUDIS_STREAM_HOLDER_HH 1
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#include <paludis/util/attributes.hh>
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#include <utility>
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#include <ostream>
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#include <ios>
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namespace paludis
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{
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/**
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* Holder for a stream so the destructor can throw.
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*/
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template <typename Stream_>
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class PALUDIS_VISIBLE StreamHolder
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{
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private:
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Stream_ s;
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typedef std::basic_ostream<typename Stream_::char_type, typename Stream_::traits_type> ostream_type;
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typedef std::basic_ios<typename Stream_::char_type, typename Stream_::traits_type> ios_type;
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public:
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///\name Basic operations
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///\{
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template<typename... Args_>
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StreamHolder(Args_ && ... args) : s(std::forward<Args_>(args)...)
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{
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}
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///\}
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///\name Formatted output
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///\{
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template <typename T_>
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StreamHolder<Stream_>& operator<<(T_ && rhs)
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{
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s << std::forward<T_>(rhs);
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return *this;
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}
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/**
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* Overload for stream manipulators (std::endl, std::flush, etc.)
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*
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* see 27.7.3.6.3
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*/
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ostream_type& operator<<(ostream_type& (*rhs)(ostream_type&))
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{
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return rhs(s);
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}
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/**
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* Overload for stream manipulators (std::endl, std::flush, etc.)
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*
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* see 27.7.3.6.3
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*/
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ostream_type& operator<<(ios_type& (*rhs)(ios_type&))
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{
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rhs(s);
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return s;
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}
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/**
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* Overload for stream manipulators (std::endl, std::flush, etc.)
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*
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* see 27.7.3.6.3
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*/
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ostream_type& operator<<(std::ios_base& (*rhs)(std::ios_base&))
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{
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rhs(s);
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return s;
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}
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///\}
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///\name Conversions
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///\{
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bool operator!() const
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{
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return !s;
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}
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operator bool() const
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{
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return s;
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}
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operator Stream_&()
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{
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return s;
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}
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operator Stream_*()
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{
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return &s;
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}
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///\}
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};
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}
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#endif
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