ceph/src/boost/libs/histogram/test/detail_static_if_test.cpp

   1 // Copyright 2015-2017 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 #include <boost/core/lightweight_test.hpp>
   8 #include <boost/histogram/detail/static_if.hpp>
   9 #include "throw_exception.hpp"
  10
  11 using namespace boost::histogram::detail;
  12
  13 int main() {
  14   using T = std::true_type;
  15   using F = std::false_type;
  16
  17   // check that branch not taken does not have to compile
  18   BOOST_TEST_EQ(static_if<T>([](auto) { return 1; }, [] {}, 0), 1);
  19   BOOST_TEST_EQ(static_if<F>([] {}, [](auto) { return 1; }, 0), 1);
  20
  21   BOOST_TEST_EQ(static_if_c<true>([](auto) { return 1; }, [] {}, 0), 1);
  22   BOOST_TEST_EQ(static_if_c<false>([] {}, [](auto) { return 1; }, 0), 1);
  23
  24   // check that noexcept is correctly propagated
  25   auto may_throw = [](auto x) { return x; };
  26   auto no_throw = [](auto x) noexcept { return x; };
  27
  28   // make this work with -fno-exceptions
  29   BOOST_TEST_EQ(noexcept(static_if<F>(no_throw, may_throw, 0)), noexcept(may_throw(0)));
  30   BOOST_TEST(noexcept(static_if<T>(no_throw, may_throw, 0)));
  31
  32   return boost::report_errors();
  33 }