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#include <vector> struct A { void foo(){} }; template< typename T > void callIfToggled( bool v1, bool &v2, T & t ) { if ( v1 != v2 ) { v2 = v1; t.foo(); } } int main() { std::vector< bool > v= { false, true, false }; const bool f = false; A a; callIfToggled( f, v[0], a ); callIfToggled( f, v[1], a ); callIfToggled( f, v[2], a ); } The compilation of the example above produces next error : dk2.cpp: In function 'int main()': dk2.cpp:29:28: error: no matching function for call to 'callIfToggled(const bool&, std::vector<bool>::reference, A&)' dk2.cpp:29:28: note: candidate is: dk2.cpp:13:6: note: template<class T> void callIfToggled(bool, bool&, T&) I compiled using g++ (version 4.6.1) like this : g++ -O3 -std=c++0x -Wall -Wextra -pedantic dk2.cpp The question is why this happens? Is vector<bool>::reference not bool& ? Or is it a compiler's bug? Or, am I trying something stupid? :)
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