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value_or() requires that U is convertible to T

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Due to Vladimir Batov.
This commit is contained in:
Andrzej Krzemienski
2014-06-14 22:49:37 +02:00
parent 8fc2901fad
commit 31c9119266
9 changed files with 66 additions and 17 deletions
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1
test/Jamfile.v2
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@ -41,5 +41,6 @@ import testing ;
[ compile-fail optional_test_ref_fail_init_from_Urefref.cpp ]
[ compile-fail optional_test_ref_fail_assign_from_Trefref.cpp ]
[ compile-fail optional_test_ref_fail_assign_from_Urefref.cpp ]
[ compile-fail optional_test_fail_explicit_convert_in_value_or.cpp ]
;
}

32
test/optional_test_fail_explicit_convert_in_value_or.cpp Normal file
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@ -0,0 +1,32 @@
// Copyright (C) 2014, Andrzej Krzemienski.
//
// Use, modification, and distribution is subject to the Boost Software
// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
// See http://www.boost.org/lib/optional for documentation.
//
// You are welcome to contact the author at:
// akrzemi1@gmail.com
//
#include "boost/optional.hpp"
//
// THIS TEST SHOULD FAIL TO COMPILE
//
struct U
{};
struct T
{
explicit T(U const&) {}
};
void test_implicit_conversion_to_bool()
{
boost::optional<T> opt;
opt.value_or(U());
}