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/**
* @file stringize.h
* @author Nat Goodspeed
* @date 2008-12-17
* @brief stringize(item) template function and STRINGIZE(expression) macro
*
* $LicenseInfo:firstyear=2008&license=viewergpl$
* Copyright (c) 2008, Linden Research, Inc.
* $/LicenseInfo$
*/
#if ! defined(LL_STRINGIZE_H)
#define LL_STRINGIZE_H
#include <sstream>
#include <boost/lambda/lambda.hpp>
/**
* stringize(item) encapsulates an idiom we use constantly, using
* operator<<(std::ostringstream&, TYPE) followed by std::ostringstream::str()
* to render a string expressing some item.
*/
template <typename T>
std::string stringize(const T& item)
{
std::ostringstream out;
out << item;
return out.str();
}
/**
* stringize_f(functor)
*/
template <typename Functor>
std::string stringize_f(Functor const & f)
{
std::ostringstream out;
f(out);
return out.str();
}
/**
* STRINGIZE(item1 << item2 << item3 ...) effectively expands to the
* following:
* @code
* std::ostringstream out;
* out << item1 << item2 << item3 ... ;
* return out.str();
* @endcode
*/
#define STRINGIZE(EXPRESSION) (stringize_f(boost::lambda::_1 << EXPRESSION))
/**
* destringize(str)
* defined for symmetry with stringize
* *NOTE - this has distinct behavior from boost::lexical_cast<T> regarding
* leading/trailing whitespace and handling of bad_lexical_cast exceptions
*/
template <typename T>
T destringize(std::string const & str)
{
T val;
std::istringstream in(str);
in >> val;
return val;
}
/**
* destringize_f(str, functor)
*/
template <typename Functor>
void destringize_f(std::string const & str, Functor const & f)
{
std::istringstream in(str);
f(in);
}
/**
* DESTRINGIZE(str, item1 >> item2 >> item3 ...) effectively expands to the
* following:
* @code
* std::istringstream in(str);
* in >> item1 >> item2 >> item3 ... ;
* @endcode
*/
#define DESTRINGIZE(STR, EXPRESSION) (destringize_f((STR), (boost::lambda::_1 >> EXPRESSION)))
#endif /* ! defined(LL_STRINGIZE_H) */
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