//===----------------------------------------------------------------------===// // // The LLVM Compiler Infrastructure // // This file is dual licensed under the MIT and the University of Illinois Open // Source Licenses. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// // <functional> // template <class T> // struct hash // : public unary_function<T, size_t> // { // size_t operator()(T val) const; // }; // Not very portable #include <vector> #include <cassert> #include <type_traits> int main() { typedef std::vector<bool> T; typedef std::hash<T> H; static_assert((std::is_base_of<std::unary_function<T, std::size_t>, H>::value), ""); bool ba[] = {true, false, true, true, false}; T vb(std::begin(ba), std::end(ba)); H h; assert(h(vb) != 0); }