Boost binding a function taking a reference
bind, boost, c++, intel, reference
Solution
`FromString()` takes 3 arguments and default arguments are not part of a functions type. So the bind expression should probably be something like:
boost::bind<int>(&FromString<int>, boost::ref(temp), _1, std::dec);
Problem
I am having problems compiling the following snippet ``` int temp; vector<int> origins; vector<string> originTokens = OTUtils::tokenize(buffer, ","); // buffer is a char[] array // original loop BOOST_FOREACH(string s, originTokens) { from_string(temp, s); origins.push_back(temp); } // I'd like to use this to replace the above loop std::transform(originTokens.begin(), originTokens.end(), origins.begin(), boost::bind<int>(&FromString<int>, boost::ref(temp), _1)); ``` where the function in question is ``` // the third parameter should be one of std::hex, std::dec or std::oct template <class T> bool FromString(T& t, const std::string& s, std::ios_base& (*f)(std::ios_base&) = std::dec) { std::istringstream iss(s); return !(iss >> f >> t).fail(); } ``` the error I get is ``` 1>Compiling with Intel(R) C++ 11.0.074 [IA-32]... (Intel C++ Environment) 1>C:\projects\svn\bdk\Source\deps\boost_1_42_0\boost/bind/bind.hpp(303): internal error: assertion failed: copy_default_arg_expr: rout NULL, no error (shared/edgcpfe/il.c, line 13919) 1> 1> return unwrapper<F>::unwrap(f, 0)(a[base_type::a1_], a[base_type::a2_]); 1> ^ 1> 1>icl: error #10298: problem during post processing of parallel object compilation ``` Google is being unusually unhelpful so I hope that some one here can provide some insights. UPDATE: Question is answered by @gf's solution, but interestingly the original function wasn't quite correct as it stored the result of the conversion operation (failed/not failed) rather than the converted value itself. I changed the signature return the converted value directly and the compiler was able to infer the type of the binding correctly. ``` // new signature T FromString(const std::string& s, std::ios_base& (*f)(std::ios_base&) = std::dec); // revised calling syntax - note that bind<int> is not required. transform(originTokens.begin(), originTokens.end(), origins.begin(), bind(&FromString<int>, _1, std::dec)); ```