c++ - Calling functions from a std::map -

i'm trying construct object serve handler functions. explain why, i'll use scan user input, check map match. if match found, call function , copy rest of user-inputted line function;

class object { public:     object(std::map<std::string, void(*)(const std::string&)> map)         {/*...code...*/}; }; 

quick example code:

class main { public:     void testfunc(const std::string& a)     {      }      void construct()     {         object{             std::map<std::string, void(*)(const std::string&)> {                 {"exit", [](const std::string &a){ exit(1); }},                 //{"test1", (void(main::*)(const std::string&))&testfunc},                 //{"test2", [](const std::string &a){ testfunc(a); }},                 //{"test3", [this](const std::string &a){ testfunc(a); }},                 {"null", null}             }         };     } }; 

neither of commented lines worked, creating different errors, other lines succeeded , there no runtime errors (well, null be, i'm handling that).

my question is, imagining mechanics of properly, if not, should save pointers , cast functions later? possible save reference , call functions inside object defined inside class scope (calls made inside class too)?

a lot of questions.. know. i've never seen done before.. guess there might reason.

because didn't specify errors, here link;

non-static member functions different non-member functions in take implicit argument - class instance. main::testfunc requires 2 arguments: main , std::string const&. interface allows single argument. way make work create global main* function reference - terribly brittle design.

instead, make interface more generic using std::function<void(std::string const&)>. any callable takes std::string const&, instead of pointer function. allow write last version:

{"test3", [this](const std::string &a){ testfunc(a); }}, 

and best bet.