110 lines
2.7 KiB
C++
110 lines
2.7 KiB
C++
/*
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FORMAT.hpp - helpers for formatting and diagnostics
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Copyright (C) Lumiera.org
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2009, 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 the
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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.hpp
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** Collection of small helpers and convenience shortcuts for diagnostics & formatting.
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**
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** @todo we could add a facade to boost::format here, see Ticket #166
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**
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*/
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#ifndef UTIL_FORMAT_H
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#define UTIL_FORMAT_H
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//#include "lib/util.hpp"
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#include "lib/meta/trait.hpp"
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#include "include/symbol.hpp"
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#include <string>
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#include <cstring>
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#include <typeinfo>
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#include <boost/utility/enable_if.hpp>
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namespace util {
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using lumiera::typelist::can_ToString;
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using lumiera::Symbol;
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using boost::enable_if;
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using boost::disable_if;
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using std::string;
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namespace { // we need to guard the string conversion
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// to avoid a compiler error in case the type isn't convertible....
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template<typename X>
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inline string
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invoke_2string ( typename enable_if< can_ToString<X>,
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X >::type const& val)
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{
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return string(val);
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}
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template<typename X>
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inline string
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invoke_2string ( typename disable_if< can_ToString<X>,
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X >::type const&)
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{
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return "";
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}
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}
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/** try to get an object converted to string */
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template<typename TY>
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inline string
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str ( TY const& val
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, Symbol prefix="" ///< prefix to prepend in case conversion is possible
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, Symbol fallback =0 /// < replacement text to show if string conversion fails
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)
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{
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if (can_ToString<TY>::value)
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return string(prefix) + invoke_2string<TY>(val);
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else
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return fallback? fallback
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: tyStr(val);
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}
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/** @return a string denoting the type. */
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template<typename TY>
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inline string
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tyStr (const TY* =0)
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{
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return string("«")+typeid(TY).name()+"»";
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}
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template<typename TY>
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inline string
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tyStr (TY const& ref)
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{ return tyStr(&ref); }
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} // namespace util
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#endif /*UTIL_FORMAT_H*/
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