forked from OSchip/llvm-project
107 lines
2.8 KiB
C++
107 lines
2.8 KiB
C++
// RUN: %clang_cc1 -fcxx-exceptions -fexceptions -fsyntax-only -verify -std=c++0x -ffreestanding %s
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#include <stdint.h>
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typedef decltype(nullptr) nullptr_t;
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struct A {};
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int o1(char*);
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void o1(uintptr_t);
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void o2(char*); // expected-note {{candidate}}
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void o2(int A::*); // expected-note {{candidate}}
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nullptr_t f(nullptr_t null)
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{
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// Implicit conversions.
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null = nullptr;
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void *p = nullptr;
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p = null;
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int *pi = nullptr;
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pi = null;
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null = 0;
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int A::*pm = nullptr;
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pm = null;
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void (*pf)() = nullptr;
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pf = null;
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void (A::*pmf)() = nullptr;
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pmf = null;
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bool b = nullptr;
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// Can't convert nullptr to integral implicitly.
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uintptr_t i = nullptr; // expected-error {{cannot initialize}}
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// Operators
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(void)(null == nullptr);
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(void)(null <= nullptr);
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(void)(null == (void*)0);
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(void)((void*)0 == nullptr);
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(void)(null <= (void*)0);
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(void)((void*)0 <= nullptr);
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(void)(0 == nullptr);
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(void)(nullptr == 0);
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(void)(nullptr <= 0);
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(void)(0 <= nullptr);
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(void)(1 > nullptr); // expected-error {{invalid operands to binary expression}}
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(void)(1 != nullptr); // expected-error {{invalid operands to binary expression}}
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(void)(1 + nullptr); // expected-error {{invalid operands to binary expression}}
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(void)(0 ? nullptr : 0); // expected-error {{non-pointer operand type 'int' incompatible with nullptr}}
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(void)(0 ? nullptr : (void*)0);
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(void)(0 ? nullptr : A()); // expected-error {{non-pointer operand type 'A' incompatible with nullptr}}
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(void)(0 ? A() : nullptr); // expected-error {{non-pointer operand type 'A' incompatible with nullptr}}
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// Overloading
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int t = o1(nullptr);
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t = o1(null);
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o2(nullptr); // expected-error {{ambiguous}}
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// nullptr is an rvalue, null is an lvalue
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(void)&nullptr; // expected-error {{address expression must be an lvalue}}
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nullptr_t *pn = &null;
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// You can reinterpret_cast nullptr to an integer.
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(void)reinterpret_cast<uintptr_t>(nullptr);
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// You can throw nullptr.
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throw nullptr;
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}
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// Template arguments can be nullptr.
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template <int *PI, void (*PF)(), int A::*PM, void (A::*PMF)()>
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struct T {};
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typedef T<nullptr, nullptr, nullptr, nullptr> NT;
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namespace test1 {
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template<typename T, typename U> struct is_same {
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static const bool value = false;
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};
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template<typename T> struct is_same<T, T> {
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static const bool value = true;
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};
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void *g(void*);
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bool g(bool);
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// Test that we prefer g(void*) over g(bool).
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static_assert(is_same<decltype(g(nullptr)), void*>::value, "");
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}
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namespace test2 {
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void f(int, ...) __attribute__((sentinel));
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void g() {
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// nullptr can be used as the sentinel value.
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f(10, nullptr);
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}
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}
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namespace test3 {
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void f(const char*, ...) __attribute__((format(printf, 1, 2)));
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void g() {
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// Don't warn when using nullptr with %p.
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f("%p", nullptr);
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}
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}
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