Re: [boost] [Proposal] A little reasonable modification of boost::bind_t

2013/5/11 Arthur Athrun :

Hi, everyone,

I'd like to propose a little modification of boost:: bind to expose more information in boost:: _bi:: bind_t. <...> With such modifications, we can access all binded arguments in the boost::_bi::bind_t. Here is a showcase.

templatevoid Test(VT t, T * p = 0) { //This parameter is not binded, so ignore it! }templatevoid Test(VT t, typename T::val_type * p = 0) { //T::val_type is the parameter's type， //and can use boost::is_same::value to check it! std::cout<<"great! we get a value here!"<

template void retrive_args(boost::_bi::bind_t > & f) { Test<A1>(f.arguments()[_1]); Test<A2>(f.arguments()[_2]); }

int f(int a, double b) { std::cout<

int main(int argc, char * argv[]) { double t = 1.0; retrive_args(boost::bind(f, _1, 0.2)); //Here will retrive the second parameters only. return 0; }

I don't know if I get the right way to implement it. Please let me know if you have another implementation. Any comments or ideas will be appreciated. Thanks.

Simpler solution would be to use boost::tuple or boost::fusion::vector to store and pass parameters separetly from function. Only after all the work with parameters done, call boost::bind and retrieve your functional object. -- Best regards, Antony Polukhin