89 lines
2.6 KiB
C++
89 lines
2.6 KiB
C++
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/*
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FormatString - string template formatting based on boost::format
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Copyright (C) Lumiera.org
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2011, Hermann Vosseler <Ichthyostega@web.de>
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of
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the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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* *****************************************************/
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/** @file format-string.cpp
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** Implementation for printf-style formatting, based on boost::format.
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** This file holds the generic implementation of our format frontend,
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** which actually just invokes boost::format. The corresponding header
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** format-string.hpp contains some template functions and classes,
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** which select an appropriate wrapper to pass the calls down.
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** Here, we define explicit specialisations for the frontend to invoke,
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** which in turn just pass on the given argument value to the embedded
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** boost::format object, which in turn integrates the formatted result
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** into an embedded string stream.
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**
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** To avoid exposing boost::format in the frontend header, we use an
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** opaque buffer of appropriate size to piggyback the formatter object.
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** @warning unfortunately this requires a hard coded buffer size constant
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** in the front-end, which we define there manually, based on
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** the current implementation layout found in the boost libraries.
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** If Boost eventually changes the implementation, the assertion
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** in our constructor will trigger.
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**
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** @see FormatString_test
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**
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*/
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#include "lib/error.hpp"
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#include "lib/format-string.hpp"
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#include <boost/format.hpp>
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#include <iostream>
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namespace util {
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namespace { // implementation details...
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}//(End) implementation details
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/** */
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_Fmt::_Fmt (string formatString)
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{
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UNIMPLEMENTED ("create the embedded boost::format object");
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}
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/** */
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_Fmt::operator string() const
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{
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UNIMPLEMENTED ("forward to the embedded boost::format object");
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}
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std::ostream&
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operator<< (std::ostream& os, _Fmt const& fmt)
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{
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return os << string(fmt);
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}
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} // namespace util
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