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Implement P1023: constexpr comparison operators for std::array

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git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@338668 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Marshall Clow
2018-08-02 02:11:06 +00:00
parent 48282b6a2a
commit 88f5d7a38b
3 changed files with 56 additions and 10 deletions
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46
test/std/containers/sequences/array/compare.pass.cpp
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@@ -9,6 +9,7 @@
// <array>
// These are all constexpr in C++20
// bool operator==(array<T, N> const&, array<T, N> const&);
// bool operator!=(array<T, N> const&, array<T, N> const&);
// bool operator<(array<T, N> const&, array<T, N> const&);
@@ -40,6 +41,41 @@ void test_compare(const Array& LHS, const Array& RHS) {
assert((LHS >= RHS) == (LHSV >= RHSV));
}
#if TEST_STD_VER > 17
template <class Array>
constexpr bool constexpr_compare(const Array &lhs, const Array &rhs, bool isEqual, bool isLess)
{
if (isEqual)
{
if (!(lhs == rhs)) return false;
if ( (lhs != rhs)) return false;
if ( (lhs < rhs)) return false;
if (!(lhs <= rhs)) return false;
if ( (lhs > rhs)) return false;
if (!(lhs >= rhs)) return false;
}
else if (isLess)
{
if ( (lhs == rhs)) return false;
if (!(lhs != rhs)) return false;
if (!(lhs < rhs)) return false;
if (!(lhs <= rhs)) return false;
if ( (lhs > rhs)) return false;
if ( (lhs >= rhs)) return false;
}
else // greater
{
if ( (lhs == rhs)) return false;
if (!(lhs != rhs)) return false;
if ( (lhs < rhs)) return false;
if ( (lhs <= rhs)) return false;
if (!(lhs > rhs)) return false;
if (!(lhs >= rhs)) return false;
}
return true;
}
#endif
int main()
{
{
@@ -60,4 +96,14 @@ int main()
C c2 = {};
test_compare(c1, c2);
}
#if TEST_STD_VER > 17
{
constexpr std::array<int, 3> a1 = {1, 2, 3};
constexpr std::array<int, 3> a2 = {2, 3, 4};
static_assert(constexpr_compare(a1, a1, true, false), "");
static_assert(constexpr_compare(a1, a2, false, true), "");
static_assert(constexpr_compare(a2, a1, false, false), "");
}
#endif
}