54 lines
1.4 KiB
C++
54 lines
1.4 KiB
C++
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// RUN: %clang_cc1 -fsyntax-only -triple x86_64-linux-gnu -verify %s
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#if !__has_extension(datasizeof)
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# error "Expected datasizeof extension"
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#endif
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struct HasPadding {
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int i;
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char c;
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};
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struct HasUsablePadding {
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int i;
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char c;
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HasUsablePadding() {}
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};
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struct Incomplete; // expected-note {{forward declaration of 'Incomplete'}}
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static_assert(__datasizeof(int) == 4);
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static_assert(__datasizeof(HasPadding) == 8);
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static_assert(__datasizeof(HasUsablePadding) == 5);
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static_assert(__datasizeof(void)); // expected-error {{invalid application of '__datasizeof' to an incomplete type 'void'}}
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static_assert(__datasizeof(Incomplete)); // expected-error {{invalid application of '__datasizeof' to an incomplete type 'Incomplete'}}
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static_assert([] {
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int* p = nullptr;
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HasPadding* p2 = nullptr;
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HasUsablePadding* p3 = nullptr;
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static_assert(__datasizeof(*p) == 4);
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static_assert(__datasizeof *p == 4);
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static_assert(__datasizeof(*p2) == 8);
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static_assert(__datasizeof(*p3) == 5);
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return true;
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}());
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template <typename Ty>
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constexpr int data_size_of() {
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return __datasizeof(Ty);
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}
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static_assert(data_size_of<int>() == __datasizeof(int));
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static_assert(data_size_of<HasPadding>() == __datasizeof(HasPadding));
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static_assert(data_size_of<HasUsablePadding>() == __datasizeof(HasUsablePadding));
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struct S {
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int i = __datasizeof(S);
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float f;
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char c;
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};
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static_assert(S{}.i == 9);
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