151 lines
3.8 KiB
C++
151 lines
3.8 KiB
C++
/**
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* @file stringize.h
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* @author Nat Goodspeed
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* @date 2008-12-17
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* @brief stringize(item) template function and STRINGIZE(expression) macro
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*
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* $LicenseInfo:firstyear=2008&license=viewerlgpl$
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* Second Life Viewer Source Code
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* Copyright (C) 2010, Linden Research, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation;
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* version 2.1 of the License only.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
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* $/LicenseInfo$
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*/
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#if ! defined(LL_STRINGIZE_H)
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#define LL_STRINGIZE_H
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#include <sstream>
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#include <boost/phoenix/phoenix.hpp>
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#include <llstring.h>
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/**
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* gstringize(item) encapsulates an idiom we use constantly, using
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* operator<<(std::ostringstream&, TYPE) followed by std::ostringstream::str()
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* or their wstring equivalents
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* to render a string expressing some item.
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*/
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template <typename CHARTYPE, typename T>
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std::basic_string<CHARTYPE> gstringize(const T& item)
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{
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std::basic_ostringstream<CHARTYPE> out;
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out << item;
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return out.str();
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}
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/**
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*partial specialization of stringize for handling wstring
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*TODO: we should have similar specializations for wchar_t[] but not until it is needed.
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*/
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inline std::string stringize(const std::wstring& item)
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{
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LL_WARNS() << "WARNING: Possible narrowing" << LL_ENDL;
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std::string s;
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s = wstring_to_utf8str(item);
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return gstringize<char>(s);
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}
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/**
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* Specialization of gstringize for std::string return types
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*/
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template <typename T>
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std::string stringize(const T& item)
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{
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return gstringize<char>(item);
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}
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/**
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* Specialization for generating wstring from string.
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* Both a convenience function and saves a miniscule amount of overhead.
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*/
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inline std::wstring wstringize(const std::string& item)
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{
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return gstringize<wchar_t>(item.c_str());
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}
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/**
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* Specialization of gstringize for std::wstring return types
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*/
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template <typename T>
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std::wstring wstringize(const T& item)
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{
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return gstringize<wchar_t>(item);
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}
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/**
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* stringize_f(functor)
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*/
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template <typename Functor>
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std::string stringize_f(Functor const & f)
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{
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std::ostringstream out;
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f(out);
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return out.str();
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}
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/**
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* STRINGIZE(item1 << item2 << item3 ...) effectively expands to the
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* following:
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* @code
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* std::ostringstream out;
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* out << item1 << item2 << item3 ... ;
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* return out.str();
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* @endcode
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*/
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#define STRINGIZE(EXPRESSION) (stringize_f(boost::phoenix::placeholders::arg1 << EXPRESSION))
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/**
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* destringize(str)
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* defined for symmetry with stringize
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* *NOTE - this has distinct behavior from boost::lexical_cast<T> regarding
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* leading/trailing whitespace and handling of bad_lexical_cast exceptions
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*/
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template <typename T>
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T destringize(std::string const & str)
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{
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T val;
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std::istringstream in(str);
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in >> val;
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return val;
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}
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/**
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* destringize_f(str, functor)
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*/
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template <typename Functor>
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void destringize_f(std::string const & str, Functor const & f)
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{
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std::istringstream in(str);
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f(in);
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}
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/**
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* DESTRINGIZE(str, item1 >> item2 >> item3 ...) effectively expands to the
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* following:
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* @code
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* std::istringstream in(str);
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* in >> item1 >> item2 >> item3 ... ;
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* @endcode
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*/
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#define DESTRINGIZE(STR, EXPRESSION) (destringize_f((STR), (boost::phoenix::placeholders::arg1 >> EXPRESSION)))
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#endif /* ! defined(LL_STRINGIZE_H) */
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