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