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// Build don't link: template <class InputIterator, class BinaryOperation> void accumulate(InputIterator first, BinaryOperation binary_op) { } template<class R> int p( int val, R& r ) { return val + r; } template<class R> void f(R) { accumulate(0, static_cast<int (*)(int, R&)>(p) ); } int main() { f(0); }