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author | Richard Smith <richard-llvm@metafoo.co.uk> | 2017-10-31 20:29:22 +0000 |
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committer | Richard Smith <richard-llvm@metafoo.co.uk> | 2017-10-31 20:29:22 +0000 |
commit | daf2537d16dfc1b82c1f183182f4363c410d9d8e (patch) | |
tree | ee28020a7992b5e10e835e828849f3d7e06a48da /test/Parser | |
parent | 7f519c8361480c7e2951b82e666eb5ccd316da01 (diff) |
Fix usage of right shift operator in fold expressions
The right shift operator was not seen as a valid operator in a fold expression, which is PR32563.
Patch by Nicolas Lesser ("Blitz Rakete")!
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@317032 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/Parser')
-rw-r--r-- | test/Parser/cxx1z-fold-expressions.cpp | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/test/Parser/cxx1z-fold-expressions.cpp b/test/Parser/cxx1z-fold-expressions.cpp index b1f7318e41..342f11555f 100644 --- a/test/Parser/cxx1z-fold-expressions.cpp +++ b/test/Parser/cxx1z-fold-expressions.cpp @@ -43,3 +43,20 @@ template<typename ...T> void as_operand_of_cast(int a, T ...t) { (int)(undeclared_junk + ...) + // expected-error {{undeclared}} (int)(a + ...); // expected-error {{does not contain any unexpanded}} } + +// fold-operator can be '>' or '>>'. +template <int... N> constexpr bool greaterThan() { return (N > ...); } +template <int... N> constexpr int rightShift() { return (N >> ...); } + +static_assert(greaterThan<2, 1>()); +static_assert(rightShift<10, 1>() == 5); + +template <auto V> constexpr auto Identity = V; + +// Support fold operators within templates. +template <int... N> constexpr int nestedFoldOperator() { + return Identity<(Identity<0> >> ... >> N)> + + Identity<(N >> ... >> Identity<0>)>; +} + +static_assert(nestedFoldOperator<3, 1>() == 1); |