27 lines
1.1 KiB
C++
27 lines
1.1 KiB
C++
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// RUN: %clang_cc1 %s -Wno-uninitialized -std=c++1z -fsyntax-only -verify
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const extern int arr[];
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constexpr auto p = arr; // ok
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constexpr int f(int i) {return p[i];} // expected-note {{read of dereferenced one-past-the-end pointer}}
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constexpr int arr[] {1, 2, 3};
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constexpr auto p2 = arr + 2; // ok
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constexpr int x = f(2); // ok
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constexpr int y = f(3); // expected-error {{constant expression}}
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// expected-note-re@-1 {{in call to 'f({{.*}})'}}
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// FIXME: consider permitting this case
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struct A {int m[];} a;
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constexpr auto p3 = a.m; // expected-error {{constant expression}} expected-note {{without known bound}}
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constexpr auto p4 = a.m + 1; // expected-error {{constant expression}} expected-note {{without known bound}}
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void g(int i) {
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int arr[i];
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constexpr auto *p = arr + 2; // expected-error {{constant expression}} expected-note {{without known bound}}
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// FIXME: Give a better diagnostic here. The issue is that computing
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// sizeof(*arr2) within the array indexing fails due to the VLA.
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int arr2[2][i];
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constexpr int m = ((void)arr2[2], 0); // expected-error {{constant expression}}
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}
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