ceph/src/boost/libs/histogram/test/std_ostream.hpp

   1 // Copyright 2018-2019 Hans Dembinski
   2 //
   3 // Distributed under the Boost Software License, Version 1.0.
   4 // (See accompanying file LICENSE_1_0.txt
   5 // or copy at http://www.boost.org/LICENSE_1_0.txt)
   6
   7 #ifndef BOOST_HISTOGRAM_TEST_STD_OSTREAM_HPP
   8 #define BOOST_HISTOGRAM_TEST_STD_OSTREAM_HPP
   9
  10 #include <boost/mp11/tuple.hpp>
  11 #include <ostream>
  12 #include <utility>
  13 #include <vector>
  14
  15 namespace std {
  16 // never add to std, we only do it here to get ADL working :(
  17 template <typename T>
  18 ostream& operator<<(ostream& os, const vector<T>& v) {
  19   os << "[ ";
  20   for (const auto& x : v) os << x << " ";
  21   os << "]";
  22   return os;
  23 }
  24
  25 template <class... Ts>
  26 ostream& operator<<(ostream& os, const std::tuple<Ts...>& t) {
  27   os << "[ ";
  28   ::boost::mp11::tuple_for_each(t, [&os](const auto& x) { os << x << " "; });
  29   os << "]";
  30   return os;
  31 }
  32
  33 template <class T, class U>
  34 ostream& operator<<(ostream& os, const std::pair<T, U>& t) {
  35   os << "[ " << t.first << " " << t.second << " ]";
  36   return os;
  37 }
  38 } // namespace std
  39
  40 #endif