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// RUN: %clang_cc1 -fsyntax-only -verify -std=c2x -ffreestanding -Wno-null-conversion -Wno-tautological-compare %s
#include <stdint.h>
typedef typeof(nullptr) nullptr_t;
struct A {};
__attribute__((overloadable)) int o1(char*);
__attribute__((overloadable)) void o1(uintptr_t);
nullptr_t f(nullptr_t null)
{
// Implicit conversions.
null = nullptr;
void *p = nullptr;
p = null;
int *pi = nullptr;
pi = null;
null = 0;
bool b = nullptr;
// Can't convert nullptr to integral implicitly.
uintptr_t i = nullptr; // expected-error-re {{initializing 'uintptr_t' (aka '{{.*}}') with an expression of incompatible type 'nullptr_t'}}
// Operators
(void)(null == nullptr);
(void)(null <= nullptr); // expected-error {{invalid operands to binary expression}}
(void)(null == 0);
(void)(null == (void*)0);
(void)((void*)0 == nullptr);
(void)(null <= 0); // expected-error {{invalid operands to binary expression}}
(void)(null <= (void*)0); // expected-error {{invalid operands to binary expression}}
(void)((void*)0 <= nullptr); // expected-error {{invalid operands to binary expression}}
(void)(0 == nullptr);
(void)(nullptr == 0);
(void)(nullptr <= 0); // expected-error {{invalid operands to binary expression}}
(void)(0 <= nullptr); // expected-error {{invalid operands to binary expression}}
(void)(1 > nullptr); // expected-error {{invalid operands to binary expression}}
(void)(1 != nullptr); // expected-error {{invalid operands to binary expression}}
(void)(1 + nullptr); // expected-error {{invalid operands to binary expression}}
(void)(0 ? nullptr : 0); // expected-error {{non-pointer operand type 'int' incompatible with nullptr}}
(void)(0 ? nullptr : (void*)0);
(void)(0 ? nullptr : (struct A){}); // expected-error {{non-pointer operand type 'struct A' incompatible with nullptr}}
(void)(0 ? (struct A){} : nullptr); // expected-error {{non-pointer operand type 'struct A' incompatible with nullptr}}
// Overloading
int t = o1(nullptr);
t = o1(null);
// nullptr is an rvalue, null is an lvalue
(void)&nullptr; // expected-error {{cannot take the address of an rvalue of type 'nullptr_t'}}
nullptr_t *pn = &null;
int *ip = *pn;
if (*pn) { }
}
__attribute__((overloadable)) void *g(void*);
__attribute__((overloadable)) bool g(bool);
// Test that we prefer g(void*) over g(bool).
static_assert(__builtin_types_compatible_p(typeof(g(nullptr)), void *), "");
void sent(int, ...) __attribute__((sentinel));
void g() {
// nullptr can be used as the sentinel value.
sent(10, nullptr);
}
void printf(const char*, ...) __attribute__((format(printf, 1, 2)));
void h() {
// Don't warn when using nullptr with %p.
printf("%p", nullptr);
}
static_assert(sizeof(nullptr_t) == sizeof(void*), "");
static_assert(!nullptr, "");
static_assert(!(bool){nullptr}, "");
static_assert(!(nullptr < nullptr), ""); // expected-error {{invalid operands to binary expression}}
static_assert(!(nullptr > nullptr), ""); // expected-error {{invalid operands to binary expression}}
static_assert( nullptr <= nullptr, ""); // expected-error {{invalid operands to binary expression}}
static_assert( nullptr >= nullptr, ""); // expected-error {{invalid operands to binary expression}}
static_assert( nullptr == nullptr, "");
static_assert(!(nullptr != nullptr), "");
static_assert(!(0 < nullptr), ""); // expected-error {{invalid operands to binary expression}}
static_assert(!(0 > nullptr), ""); // expected-error {{invalid operands to binary expression}}
static_assert( 0 <= nullptr, ""); // expected-error {{invalid operands to binary expression}}
static_assert( 0 >= nullptr, ""); // expected-error {{invalid operands to binary expression}}
static_assert( 0 == nullptr, "");
static_assert(!(0 != nullptr), "");
static_assert(!(nullptr < 0), ""); // expected-error {{invalid operands to binary expression}}
static_assert(!(nullptr > 0), ""); // expected-error {{invalid operands to binary expression}}
static_assert( nullptr <= 0, ""); // expected-error {{invalid operands to binary expression}}
static_assert( nullptr >= 0, ""); // expected-error {{invalid operands to binary expression}}
static_assert( nullptr == 0, "");
static_assert(!(nullptr != 0), "");
__attribute__((overloadable)) int f1(int*);
__attribute__((overloadable)) float f1(bool);
void test_f1() {
int ir = (f1)(nullptr);
}
// __nullptr keyword in C
void foo(void *);
void bar() { foo(__nullptr); }
static_assert(nullptr == __nullptr);
static_assert(__nullptr == 0); // Test that its value matches that of NULL
static_assert(_Generic(typeof(__nullptr), nullptr_t: true, default: false));
static_assert(_Generic(__typeof(__nullptr), int : 0, void * : 0, default : 1)); // Test that it's type is not the same as what NULL would generally have.
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