fixed minof

include/gp/algorithm/min_of.hpp

@@ -11,7 +11,7 @@ namespace gp{
 
 	template<typename it, typename transform>
 	auto&& min_of(it beg, it end, transform fn = identity) {
-		gp_config::assertion(beg == end, "min_of provided with empty range");
+		gp_config::assertion(beg != end, "min_of provided with empty range");
 		auto fn_v = fn(*beg);
 		++beg;
 		while(beg != end) {