ceph/src/boost/libs/optional/test/optional_test_convert_from_T.cpp

   1 // Copyright (C) 2014 Andrzej Krzemienski.
   2 //
   3 // Use, modification, and distribution is subject to the Boost Software
   4 // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
   5 // http://www.boost.org/LICENSE_1_0.txt)
   6 //
   7 // See http://www.boost.org/lib/optional for documentation.
   8 //
   9 // You are welcome to contact the author at:
  10 //  akrzemi1@gmail.com
  11
  12 #include "boost/optional/optional.hpp"
  13
  14 #ifdef BOOST_BORLANDC
  15 #pragma hdrstop
  16 #endif
  17
  18 #include "boost/core/lightweight_test.hpp"
  19 #include "boost/none.hpp"
  20
  21 //#ifndef BOOST_OPTIONAL_NO_CONVERTING_COPY_CTOR
  22
  23 using boost::optional;
  24 using boost::none;
  25
  26 template <typename U>
  27 struct superconv
  28 {
  29   #ifndef BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES
  30   template <typename T>
  31     superconv(T&&) { BOOST_STATIC_ASSERT(sizeof(T) == 0); }
  32   #else
  33   template <typename T>
  34     superconv(const T&) { BOOST_STATIC_ASSERT(sizeof(T) == 0); }
  35   template <typename T>
  36     superconv(      T&) { BOOST_STATIC_ASSERT(sizeof(T) == 0); }
  37   #endif
  38
  39   superconv() {}
  40 };
  41
  42 void test_optional_of_superconverting_T() // compile-time test
  43 {
  44 #ifndef BOOST_OPTIONAL_DETAIL_NO_IS_CONSTRUCTIBLE_TRAIT
  45   superconv<optional<int> > s;
  46    superconv<optional<int> > & rs = s;
  47   optional<superconv<optional<int> > > os = rs;
  48 #endif
  49 }
  50
  51 void test_optional_optional_T()
  52 {
  53   optional<int> oi1 (1), oiN;
  54   optional< optional<int> > ooi1 (oi1), ooiN(oiN);
  55
  56   BOOST_TEST(ooi1);
  57   BOOST_TEST(*ooi1);
  58   BOOST_TEST_EQ(**ooi1, 1);
  59
  60   BOOST_TEST(ooiN);
  61   BOOST_TEST(!*ooiN);
  62 }
  63
  64 int main()
  65 {
  66     test_optional_optional_T();
  67     test_optional_of_superconverting_T();
  68
  69     return boost::report_errors();
  70 }