/** * @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) */