c++ - Strange "Could not deduce template argument for 'T'" error -

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the error in this code:

//myutil.h template <class t, class predicate> t conditionalinput(lpstr inputmessage, lpstr errormessage, predicate condition);      //myutil.cpp template <class t, class pred> t conditionalinput(lpstr inputmessage, lpstr errormessage, pred condition) {         t input         cout<< inputmessage;         cin>> input;         while(!condition(input))         {                 cout<< errormessage;                 cin>> input;         }         return input; }  ...  //c_main.cpp  int row;  row = conditionalinput("input row of number lookup, row > 0: ", "[input error]: specified number not contained in range [row > 0]. " "please type again: ", [](int x){ return x > 0; });

the error is:

error   1       error c2783: 't conditionalinput(lpstr,lpstr,predicate)' : not deduce template argument 't' c_main.cpp        17      1

i've been struggling hours can't seem find solution. believe mistake might trivial, couldn't find else encountering error under similar circumstances. appreciated!

edit: correction made frederik slijkerman fixes 1 issue creates another. time error is:

error   1   error lnk2019: unresolved external symbol "int __cdecl conditionalinput<int,class `anonymous namespace'::<lambda0> >(char *,char *,class `anonymous namespace'::<lambda0>)" (??$conditionalinput@hv<lambda0>@?a0x109237b6@@@@yahpad0v<lambda0>@?a0x109237b6@@@z) referenced in function _main

please bear me , me solve issue.

c++ cannot deduce return type of function. works arguments. have explicitly call conditionalinput<int>(...).


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