// Copyright 2013 Antony Polukhin // Distributed under the Boost Software License, Version 1.0. // (See the accompanying file LICENSE_1_0.txt // or a copy at <http://www.boost.org/LICENSE_1_0.txt>.) //[lexical_cast_stringize /*` In this example we'll make a `stringize` method that accepts a sequence, converts each element of the sequence into string and appends that string to the result. Example is based on the example from the [@http://www.packtpub.com/boost-cplusplus-application-development-cookbook/book Boost C++ Application Development Cookbook] by Antony Polukhin, ISBN 9781849514880. Step 1: Making a functor that converts any type to a string and remembers result: */ #include <boost/lexical_cast.hpp> struct stringize_functor { private: std::string& result; public: explicit stringize_functor(std::string& res) : result(res) {} template <class T> void operator()(const T& v) const { result += boost::lexical_cast<std::string>(v); } }; //` Step 2: Applying `stringize_functor` to each element in sequence: #include <boost/fusion/include/for_each.hpp> template <class Sequence> std::string stringize(const Sequence& seq) { std::string result; boost::fusion::for_each(seq, stringize_functor(result)); return result; } //` Step 3: Using the `stringize` with different types: #include <cassert> #include <boost/fusion/adapted/boost_tuple.hpp> #include <boost/fusion/adapted/std_pair.hpp> int main() { boost::tuple<char, int, char, int> decim('-', 10, 'e', 5); assert(stringize(decim) == "-10e5"); std::pair<short, std::string> value_and_type(270, "Kelvin"); assert(stringize(value_and_type) == "270Kelvin"); } //] [/lexical_cast_stringize]