/usr/include/tnt/convert.h is in libtntnet-dev 2.2.1-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* Copyright (C) 2004,2006 Tommi Maekitalo
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* As a special exception, you may use this file as part of a free
* software library without restriction. Specifically, if other files
* instantiate templates or use macros or inline functions from this
* file, or you compile this file and link it with other files to
* produce an executable, this file does not by itself cause the
* resulting executable to be covered by the GNU General Public
* License. This exception does not however invalidate any other
* reasons why the executable file might be covered by the GNU Library
* General Public License.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef TNT_CONVERT_H
#define TNT_CONVERT_H
#include <sstream>
#include <stdexcept>
#include <locale>
#include <cxxtools/convert.h>
namespace tnt
{
class ConversionError : public std::runtime_error
{
explicit ConversionError(const std::string& msg);
public:
static void doThrow(const char* argname, const char* typeto, const std::string& value);
};
template <typename T>
inline std::string toString(const T& value)
{
std::ostringstream s;
s << value;
return s.str();
}
template <typename T>
inline std::string toString(const T& value, const std::locale& loc)
{
std::ostringstream s;
s.imbue(loc);
s << value;
return s.str();
}
template <>
inline std::string toString(const std::string& value)
{ return value; }
template <>
inline std::string toString(const std::string& value, const std::locale&)
{ return value; }
inline std::string toString(const char* value)
{ return std::string(value); }
inline std::string toString(const char* value, const std::locale&)
{ return std::string(value); }
inline std::string toString(char value)
{ return std::string(1, value); }
inline std::string toString(char value, const std::locale&)
{ return std::string(1, value); }
inline std::string toString(bool value)
{
static const std::string trueValue = "1";
return value ? trueValue : std::string();
}
inline std::string toString(bool value, const std::locale&)
{ return toString(value); }
// convert std::string to some type
template <typename T>
inline T stringTo(const char* argname, const char* typeto, const std::string& value)
{
T ret;
std::istringstream s(value);
s >> ret;
if (!s)
ConversionError::doThrow(argname, typeto, value);
return ret;
}
template <typename T>
inline T stringTo(const char* argname, const char* typeto, const std::string& value, const std::locale& loc)
{
T ret;
std::istringstream s(value);
s.imbue(loc);
s >> ret;
if (!s)
ConversionError::doThrow(argname, typeto, value);
return ret;
}
template <typename T>
inline T stringToWithDefault(const std::string& value, const T& def)
{
try
{
return cxxtools::convert<T>(value);
}
catch (const cxxtools::ConversionError&)
{
return def;
}
}
template <typename T>
inline T stringToWithDefault(const std::string& value, const T& def, const std::locale& loc)
{
T ret;
std::istringstream s(value);
s.imbue(loc);
s >> ret;
if (!s)
return def;
return ret;
}
// specializations
template <>
inline std::string stringTo<std::string>(const char* /*argname*/, const char* /*typeto*/, const std::string& value)
{ return value; }
template <>
inline std::string stringTo<std::string>(const char* /*argname*/, const char* /*typeto*/, const std::string& value, const std::locale&)
{ return value; }
template <>
inline char stringTo<char>(const char* argname, const char* typeto, const std::string& value)
{
if (value.empty())
ConversionError::doThrow(argname, typeto, value);
return value[0];
}
template <>
inline char stringTo<char>(const char* argname, const char* typeto, const std::string& value, const std::locale&)
{ return stringTo<char>(argname, typeto, value); }
template <>
inline bool stringTo<bool>(const char* /*argname*/, const char* /*typeto*/, const std::string& value)
{
// consider empty value as false
return !value.empty();
}
template <>
inline bool stringTo<bool>(const char* /*argname*/, const char* /*typeto*/, const std::string& value, const std::locale&)
{ return stringTo<bool>(0, 0, value); }
template <>
inline std::string stringToWithDefault<std::string>(const std::string& value, const std::string&)
{ return value; }
template <>
inline std::string stringToWithDefault<std::string>(const std::string& value, const std::string&, const std::locale&)
{ return value; }
template <>
inline char stringToWithDefault<char>(const std::string& value, const char& def)
{ return value.empty() ? def : value[0]; }
template <>
inline char stringToWithDefault<char>(const std::string& value, const char& def, const std::locale&)
{ return value.empty() ? def : value[0]; }
template <>
inline bool stringToWithDefault<bool>(const std::string& value, const bool& def)
{
return value.empty() ? def
: stringTo<bool>(0, 0, value);
}
template <>
inline bool stringToWithDefault<bool>(const std::string& value, const bool& def, const std::locale&)
{ return stringToWithDefault<bool>(value, def); }
template <typename iteratorType, typename vectorType>
void convertRange(const char* argname, const char* typeto, iteratorType b, iteratorType e, vectorType& v, const std::locale& l)
{
for (iteratorType it = b; it != e; ++it)
v.push_back(stringTo<typename vectorType::value_type>(argname, typeto, *it, l));
}
}
#endif // TNT_CONVERT_H
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