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Diffstat (limited to 'test/Parser/cxx1z-fold-expressions.cpp')
| -rw-r--r-- | test/Parser/cxx1z-fold-expressions.cpp | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/test/Parser/cxx1z-fold-expressions.cpp b/test/Parser/cxx1z-fold-expressions.cpp new file mode 100644 index 0000000..a908311 --- /dev/null +++ b/test/Parser/cxx1z-fold-expressions.cpp @@ -0,0 +1,29 @@ +// RUN: %clang_cc1 -std=c++1z -verify %s + +template<typename ...T> constexpr auto sum(T ...t) { return (... + t); } +template<typename ...T> constexpr auto product(T ...t) { return (t * ...); } +template<typename ...T> constexpr auto all(T ...t) { return (true && ... && t); } +template<typename ...T> constexpr auto all2(T ...t) { return (t && ... && true); } + +int k1 = (1 + ... + 2); // expected-error {{does not contain any unexpanded parameter packs}} +int k2 = (1 + ...); // expected-error {{does not contain any unexpanded parameter packs}} +int k3 = (... + 2); // expected-error {{does not contain any unexpanded parameter packs}} + +template<int ...N> void bad1() { (N + ... + N); } // expected-error {{unexpanded parameter packs in both operands}} +// FIXME: it would be reasonable to support this as an extension. +template<int ...N> void bad2() { (2 * N + ... + 1); } // expected-error {{expression not permitted as operand}} +template<int ...N> void bad3() { (2 + N * ... * 1); } // expected-error {{expression not permitted as operand}} +template<int ...N, int ...M> void bad4(int (&...x)[N]) { (N + M * ... * 1); } // expected-error {{expression not permitted as operand}} +template<int ...N, int ...M> void fixed4(int (&...x)[N]) { ((N + M) * ... * 1); } + +// Parens are mandatory. +template<int ...N> void bad5() { N + ...; } // expected-error {{expected expression}} expected-error +{{}} +template<int ...N> void bad6() { ... + N; } // expected-error {{expected expression}} +template<int ...N> void bad7() { N + ... + N; } // expected-error {{expected expression}} expected-error +{{}} + +// Must have a fold-operator in the relevant places. +template<int ...N> int bad8() { return (N + ... * 3); } // expected-error {{operators in fold expression must be the same}} +template<int ...N> int bad9() { return (3 + ... * N); } // expected-error {{operators in fold expression must be the same}} +template<int ...N> int bad10() { return (3 ? ... : N); } // expected-error +{{}} expected-note {{to match}} +template<int ...N> int bad11() { return (N + ... 0); } // expected-error {{expected a foldable binary operator}} expected-error {{expected expression}} +template<int ...N> int bad12() { return (... N); } // expected-error {{expected expression}} |
