ceph/src/boost/libs/hana/test/string/to.cpp

   1 // Copyright Louis Dionne 2013-2016
   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/core/to.hpp>
   7 #include <boost/hana/string.hpp>
   8
   9 #include <cstring>
  10 namespace hana = boost::hana;
  11
  12
  13 static_assert(hana::is_convertible<hana::string_tag, char const*>{}, "");
  14 static_assert(!hana::is_embedded<hana::string_tag, char const*>{}, "");
  15
  16 int main() {
  17     BOOST_HANA_RUNTIME_CHECK(std::strcmp(
  18         hana::to<char const*>(BOOST_HANA_STRING("")),
  19         ""
  20     ) == 0);
  21
  22     BOOST_HANA_RUNTIME_CHECK(std::strcmp(
  23         hana::to<char const*>(BOOST_HANA_STRING("a")),
  24         "a"
  25     ) == 0);
  26
  27     BOOST_HANA_RUNTIME_CHECK(std::strcmp(
  28         hana::to<char const*>(BOOST_HANA_STRING("ab")),
  29         "ab"
  30     ) == 0);
  31
  32     BOOST_HANA_RUNTIME_CHECK(std::strcmp(
  33         hana::to<char const*>(BOOST_HANA_STRING("abc")),
  34         "abc"
  35     ) == 0);
  36
  37     BOOST_HANA_RUNTIME_CHECK(std::strcmp(
  38         hana::to<char const*>(BOOST_HANA_STRING("abcd")),
  39         "abcd"
  40     ) == 0);
  41
  42     // make sure we can turn a non-constexpr hana::string
  43     // into a constexpr char const*
  44     auto str = BOOST_HANA_STRING("abcdef");
  45     constexpr char const* c_str = hana::to<char const*>(str);
  46     (void)c_str;
  47 }