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author | 2013-04-26 17:44:53 +0200 | |
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committer | 2013-04-28 00:19:21 +0200 | |
commit | e6f2cd8e251e7360c6b9f0920fefb72c01daa098 (patch) | |
tree | e7384a4c7a5ba472fe7de438e5b3d380b53b3765 | |
parent | 149850cb8bc0d261dd9f93161e5bf1f132fe6ed2 (diff) | |
download | paludis-e6f2cd8e251e7360c6b9f0920fefb72c01daa098.tar.gz paludis-e6f2cd8e251e7360c6b9f0920fefb72c01daa098.tar.xz |
Add StreamHolder
-rw-r--r-- | paludis/util/files.m4 | 1 | ||||
-rw-r--r-- | paludis/util/stream_holder.hh | 123 |
2 files changed, 124 insertions, 0 deletions
diff --git a/paludis/util/files.m4 b/paludis/util/files.m4 index 28a780c77..39c2f2c33 100644 --- a/paludis/util/files.m4 +++ b/paludis/util/files.m4 @@ -79,6 +79,7 @@ add(`sha256', `hh', `cc', `gtest') add(`sha512', `hh', `cc', `gtest') add(`simple_parser', `hh', `cc', `gtest', `fwd') add(`singleton', `hh', `impl', `gtest') +add(`stream_holder', `hh') add(`stringify', `hh', `gtest') add(`string_list_stream', `hh', `cc', `fwd', `gtest') add(`strip', `hh', `cc', `gtest') diff --git a/paludis/util/stream_holder.hh b/paludis/util/stream_holder.hh new file mode 100644 index 000000000..dea8c6f37 --- /dev/null +++ b/paludis/util/stream_holder.hh @@ -0,0 +1,123 @@ +/* vim: set sw=4 sts=4 et foldmethod=syntax : */ + +/* + * Copyright (c) 2013 Wouter van Kesteren <woutershep@gmail.com> + * + * This file is part of the Paludis package manager. Paludis is free software; + * you can redistribute it and/or modify it under the terms of the GNU General + * Public License version 2, as published by the Free Software Foundation. + * + * Paludis is distributed in the hope that it will be useful, but WITHOUT ANY + * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS + * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more + * details. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., 59 Temple + * Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#ifndef PALUDIS_GUARD_PALUDIS_STREAM_HOLDER_HH +#define PALUDIS_GUARD_PALUDIS_STREAM_HOLDER_HH 1 + +#include <paludis/util/attributes.hh> +#include <utility> +#include <ostream> +#include <ios> + +namespace paludis +{ + /** + * Holder for a stream so the destructor can throw. + */ + template <typename Stream_> + class PALUDIS_VISIBLE StreamHolder + { + private: + Stream_ s; + typedef std::basic_ostream<typename Stream_::char_type, typename Stream_::traits_type> ostream_type; + typedef std::basic_ios<typename Stream_::char_type, typename Stream_::traits_type> ios_type; + + public: + ///\name Basic operations + ///\{ + + template<typename... Args_> + StreamHolder(Args_ && ... args) : s(std::forward<Args_>(args)...) + { + } + + ///\} + + ///\name Formatted output + ///\{ + + template <typename T_> + StreamHolder<Stream_>& operator<<(T_ && rhs) + { + s << std::forward<T_>(rhs); + return *this; + } + + /** + * Overload for stream manipulators (std::endl, std::flush, etc.) + * + * see 27.7.3.6.3 + */ + ostream_type& operator<<(ostream_type& (*rhs)(ostream_type&)) + { + return rhs(s); + } + + /** + * Overload for stream manipulators (std::endl, std::flush, etc.) + * + * see 27.7.3.6.3 + */ + ostream_type& operator<<(ios_type& (*rhs)(ios_type&)) + { + rhs(s); + return s; + } + + /** + * Overload for stream manipulators (std::endl, std::flush, etc.) + * + * see 27.7.3.6.3 + */ + ostream_type& operator<<(std::ios_base& (*rhs)(std::ios_base&)) + { + rhs(s); + return s; + } + + ///\} + + ///\name Conversions + ///\{ + + bool operator!() const + { + return !s; + } + + operator bool() const + { + return s; + } + + operator Stream_&() + { + return s; + } + + operator Stream_*() + { + return &s; + } + + ///\} + }; +} + +#endif |