ceph/src/boost/libs/hana/example/functional/overload_linearly.cpp

   1 // Copyright Louis Dionne 2013-2017
   2 // Distributed under the Boost Software License, Version 1.0.
   3 // (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
   4
   5 #include <boost/hana/assert.hpp>
   6 #include <boost/hana/functional/overload_linearly.hpp>
   7
   8 #include <string>
   9 namespace hana = boost::hana;
  10
  11
  12 auto f = hana::overload_linearly(
  13     [](int i) { return i + 1; },
  14     [](std::string s) { return s + "d"; },
  15     [](double) { BOOST_HANA_RUNTIME_CHECK(false && "never called"); }
  16 );
  17
  18 int main() {
  19     BOOST_HANA_RUNTIME_CHECK(f(1) == 2);
  20     BOOST_HANA_RUNTIME_CHECK(f("abc") == "abcd");
  21     BOOST_HANA_RUNTIME_CHECK(f(2.2) == static_cast<int>(2.2) + 1);
  22 }