(C++) No matching function for call to 'ptr_fun'

 

Compile error.

 

 

 

 

 

Full error message

 

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MyMain.cpp:26: error: no matching function for call to ‘ptr_fun(<unresolved overloaded function type>)’

 

 

 

 

 

Cause

 

IDE: Qt Creator 1.2.1

Project type: Qt4 Console Application

Selected required modules: QtCore

Compiler: G++ 4.4.1

 

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#include <algorithm> #include <cctype> #include <string> //From http://www.richelbilderbeek.nl/CppStrToUpper.htm const std::string StrToUpper(std::string s) {   std::transform(s.begin(), s.end(), s.begin(),std::ptr_fun(std::toupper));   return s; }

 

 

 

 

 

Solution

 

Explicitly add the template parameters:

 

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#include <algorithm> #include <cctype> #include <string> //From http://www.richelbilderbeek.nl/CppStrToUpper.htm const std::string StrToUpper(std::string s) {   std::transform(s.begin(), s.end(), s.begin(),std::ptr_fun<int,int>(std::toupper));   return s; }