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/*=============================================================================
Copyright (c) 2016 Lee Clagett
Distributed under 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)
==============================================================================*/
#include <boost/fusion/sequence/comparison.hpp>
#include <boost/mpl/identity.hpp>
namespace test_detail
{
struct convertible
{
convertible() : value_() {}
convertible(int value) : value_(value) {}
int value_;
};
bool operator==(convertible const& lhs, convertible const& rhs)
{
return lhs.value_ == rhs.value_;
}
bool operator!=(convertible const& lhs, convertible const& rhs)
{
return lhs.value_ != rhs.value_;
}
// Testing conversion at function call allows for testing mutable lvalue,
// const lvalue, and rvalue as the source. mpl::identity prevents deduction
template <typename T>
T implicit_construct(typename boost::mpl::identity<T>::type source)
{
return source;
}
template <typename F, typename Source, typename Expected>
bool run(Source const& source, Expected const& expected)
{
return F()(source, expected);
}
template <typename F, typename Source>
bool run(Source const& source)
{
return run<F>(source, source);
}
template <typename T>
struct can_rvalue_implicit_construct
{
template<typename Source, typename Expected>
bool operator()(Source const& source, Expected const& expected) const
{
return expected == implicit_construct<T>(implicit_construct<Source>(source));
}
};
template <typename T>
struct can_lvalue_implicit_construct
{
template <typename Source, typename Expected>
bool operator()(Source source, Expected const& expected) const
{
return expected == implicit_construct<T>(source);
}
};
template <typename T>
struct can_const_lvalue_implicit_construct
{
template <typename Source, typename Expected>
bool operator()(Source const& source, Expected const& expected) const
{
return expected == implicit_construct<T>(source);
}
};
template <typename T>
struct can_implicit_construct
{
template <typename Source, typename Expected>
bool operator()(Source const& source, Expected const& expected) const
{
return
run< can_rvalue_implicit_construct<T> >(source, expected) &&
run< can_lvalue_implicit_construct<T> >(source, expected) &&
run< can_const_lvalue_implicit_construct<T> >(source, expected);
}
};
template <typename T>
struct can_rvalue_construct
{
template<typename Source, typename Expected>
bool operator()(Source const& source, Expected const& expected) const
{
return expected == T(implicit_construct<Source>(source));
}
};
template <typename T>
struct can_lvalue_construct
{
template <typename Source, typename Expected>
bool operator()(Source source, Expected const& expected) const
{
return expected == T(source);
}
};
template <typename T>
struct can_const_lvalue_construct
{
template <typename Source, typename Expected>
bool operator()(Source const& source, Expected const& expected) const
{
return expected == T(source);
}
};
template <typename T>
struct can_construct
{
template <typename Source, typename Expected>
bool operator()(Source const& source, Expected const& expected) const
{
return
run< can_rvalue_construct<T> >(source, expected) &&
run< can_lvalue_construct<T> >(source, expected) &&
run< can_const_lvalue_construct<T> >(source, expected);
}
};
template <typename T>
struct can_rvalue_assign
{
template <typename Source, typename Expected>
bool operator()(Source const& source, Expected const& expected) const
{
bool result = true;
{
T seq;
result &= (seq == expected || seq != expected);
seq = implicit_construct<Source>(source);
result &= (seq == expected);
}
return result;
}
};
template <typename T>
struct can_lvalue_assign
{
template <typename Source, typename Expected>
bool operator()(Source source, Expected const& expected) const
{
bool result = true;
{
T seq;
result &= (seq == expected || seq != expected);
seq = source;
result &= (seq == expected);
}
return result;
}
};
template <typename T>
struct can_const_lvalue_assign
{
template <typename Source, typename Expected>
bool operator()(Source const& source, Expected const& expected) const
{
bool result = true;
{
T seq;
result &= (seq == expected || seq != expected);
seq = source;
result &= (seq == expected);
}
return result;
}
};
template <typename T>
struct can_assign
{
template <typename Source, typename Expected>
bool operator()(Source const& source, Expected const& expected) const
{
return
run< can_rvalue_assign<T> >(source, expected) &&
run< can_lvalue_assign<T> >(source, expected) &&
run< can_const_lvalue_assign<T> >(source, expected);
}
};
template <typename T>
struct can_copy
{
template <typename Source, typename Expected>
bool operator()(Source const& source, Expected const& expected) const
{
return
run< can_construct<T> >(source, expected) &&
run< can_implicit_construct<T> >(source, expected) &&
run< can_assign<T> >(source, expected);
}
};
} // test_detail
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