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Summary: This change implements parse-only acceptance of the optional requires-clause in a template-declaration. Diagnostic testing is added for cases where the grammar is ambiguous with the expectation that the longest token sequence which matches the syntax of a constraint-expression is consumed without backtracking. Reviewers: faisalv, fraggamuffin, rsmith Reviewed By: rsmith Subscribers: cfe-commits Differential Revision: http://reviews.llvm.org/D10462 llvm-svn: 240611
30 lines
1.2 KiB
C++
30 lines
1.2 KiB
C++
// RUN: %clang_cc1 -std=c++14 -fconcepts-ts -x c++ %s -verify
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// Test parsing of constraint-expressions in cases where the grammar is
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// ambiguous with the expectation that the longest token sequence which matches
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// the syntax is consumed without backtracking.
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// type-specifier-seq in conversion-type-id
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template <typename T> requires (bool)&T::operator short
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unsigned int foo(); // expected-error {{C++ requires a type specifier for all declarations}}
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// type-specifier-seq in new-type-id
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template <typename T> requires (bool)sizeof new (T::f()) short
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unsigned int bar(); // expected-error {{C++ requires a type specifier for all declarations}}
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template<typename T> requires (bool)sizeof new (T::f()) unsigned // expected-error {{'struct' cannot be signed or unsigned}}
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struct X { }; // expected-error {{'X' cannot be defined in a type specifier}}
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// C-style cast
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// of function call on function-style cast
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template <typename T> requires (bool(T()))
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T (*fp)(); // expected-error {{use of undeclared identifier 'fp'}}
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// function-style cast
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// as the callee in a function call
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struct A {
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static int t;
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template <typename T> requires bool(T())
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(A(T (&t))) { } // expected-error {{called object type 'bool' is not a function or function pointer}}
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};
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