91 lines
2.0 KiB
C++
91 lines
2.0 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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* $LicenseInfo:firstyear=2008&license=viewergpl$
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* Copyright (c) 2008, Linden Research, Inc.
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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/lambda/lambda.hpp>
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/**
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* stringize(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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* to render a string expressing some item.
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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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std::ostringstream 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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* 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::lambda::_1 << 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::lambda::_1 >> EXPRESSION)))
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#endif /* ! defined(LL_STRINGIZE_H) */
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