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Here is my C++ code (I'm using Visual C++ 2010): int absd(int t) { return abs(t); } int main() { try { int dpi = 137; int dpiCriterionAry[] = {100, 150, 200, 300, 400, 500, 600}; std::vector<int> vec(dpiCriterionAry, dpiCriterionAry + _countof(dpiCriterionAry)); std::transform(vec.begin(), vec.end(), vec.begin(), std::bind1st(std::minus<int>(), dpi)); std::transform(vec.begin(), vec.end(), vec.begin(), absd); //std::transform(vec.begin(), vec.end(), vec.begin(), abs); copy(vec.begin(), vec.end(), ostream_iterator<int>(cout, "\t")); cout << endl; } catch(exception& e) { cerr << e.what() << endl; } return 0; } when I uncomment the line: //std::transform(vec.begin(), vec.end(), vec.begin(), abs); I got the error message: 1>------ Build started: Project: Console, Configuration: Release Win32 ------ 1>Build started 2012/10/16 21:17:19. 1>InitializeBuildStatus: 1> Creating "..\Intermediate\Console.unsuccessfulbuild" because "AlwaysCreate" was specified. 1>ClCompile: 1> Console.cpp 1>Console.cpp(16): error C2780: '_OutIt std::transform(_InIt1,_InIt1,_InIt2,_OutIt,_Fn2)' : expects 5 arguments - 4 provided 1> D:\ProgramFiles\VS 2010\VC\include\algorithm(1155) : see declaration of 'std::transform' 1>Console.cpp(16): error C2914: 'std::transform' : cannot deduce template argument as function argument is ambiguous 1>Console.cpp(16): error C2914: 'std::transform' : cannot deduce template argument as function argument is ambiguous 1>Console.cpp(16): error C2784: '_OutIt std::transform(_InIt,_InIt,_OutIt,_Fn1)' : could not deduce template argument for '_OutIt' from 'std::_Vector_iterator<_Myvec>' 1> with 1> [ 1> _Myvec=std::_Vector_val<int,std::allocator&

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