forked from OSchip/llvm-project
132 lines
3.2 KiB
C++
132 lines
3.2 KiB
C++
// RUN: %clang_cc1 -fsyntax-only -std=c++11 -verify %s
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// RUN: %clang_cc1 -fsyntax-only -std=c++14 -verify %s
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// expected-no-diagnostics
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// Test default template arguments for function templates.
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template<typename T = int>
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void f0();
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template<typename T>
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void f0();
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void g0() {
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f0(); // okay!
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}
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template<typename T, int N = T::value>
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int &f1(T);
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float &f1(...);
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struct HasValue {
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static const int value = 17;
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};
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void g1() {
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float &fr = f1(15);
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int &ir = f1(HasValue());
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}
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namespace PR16689 {
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template <typename T1, typename T2> class tuple {
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public:
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template <typename = T2>
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constexpr tuple() {}
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};
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template <class X, class... Y> struct a : public X {
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using X::X;
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};
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auto x = a<tuple<int, int> >();
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}
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namespace PR16975 {
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template <typename...> struct is {
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constexpr operator bool() const { return false; }
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};
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template <typename... Types>
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struct bar {
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template <typename T,
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bool = is<Types...>()>
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bar(T);
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};
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bar<> foo{0};
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struct baz : public bar<> {
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using bar::bar;
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};
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baz data{0};
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}
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// rdar://23810407
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// An IRGen failure due to a symbol collision due to a default argument
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// being instantiated twice. Credit goes to Richard Smith for this
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// reduction to a -fsyntax-only failure.
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namespace rdar23810407 {
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// Instantiating the default argument multiple times will produce two
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// different lambda types and thus instantiate this function multiple
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// times, which will produce conflicting extern variable declarations.
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template<typename T> int f(T t) {
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extern T rdar23810407_variable;
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return 0;
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}
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template<typename T> int g(int a = f([] {}));
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void test() {
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g<int>();
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g<int>();
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}
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}
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// rdar://problem/24480205
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namespace PR13986 {
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constexpr unsigned Dynamic = 0;
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template <unsigned> class A { template <unsigned = Dynamic> void m_fn1(); };
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class Test {
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~Test() {}
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A<1> m_target;
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};
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}
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// rdar://problem/34167492
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// Template B is instantiated during checking if defaulted A copy constructor
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// is constexpr. For this we check if S<int> copy constructor is constexpr. And
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// for this we check S constructor template with default argument that mentions
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// template B. In turn, template instantiation triggers checking defaulted
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// members exception spec. The problem is that it checks defaulted members not
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// for instantiated class only, but all defaulted members so far. In this case
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// we try to check exception spec for A default constructor which requires
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// initializer for the field _a. But initializers are added after constexpr
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// check so we reject the code because cannot find _a initializer.
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namespace rdar34167492 {
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template <typename T> struct B { using type = bool; };
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template <typename T> struct S {
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S() noexcept;
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template <typename U, typename B<U>::type = true>
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S(const S<U>&) noexcept;
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};
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class A {
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A() noexcept = default;
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A(const A&) noexcept = default;
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S<int> _a{};
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};
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}
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#if __cplusplus >= 201402L
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namespace lambda {
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// Verify that a default argument in a lambda can refer to the type of a
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// previous `auto` argument without crashing.
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template <class T>
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void bar() {
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(void) [](auto c, int x = sizeof(decltype(c))) {};
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}
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void foo() {
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bar<int>();
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}
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} // namespace lambda
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#endif
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