test/SemaCXX/cxx0x-defaulted-functions.cpp

// RUN: %clang_cc1 -std=c++11 -fsyntax-only -verify %s

void fn() = default; // expected-error {{only special member}}
struct foo {
  void fn() = default; // expected-error {{only special member}}

  foo() = default;
  foo(const foo&) = default;
  foo(foo&&) = default;
  foo& operator = (const foo&) = default;
  foo& operator = (foo&&) = default;
  ~foo() = default;
};

struct bar {
  bar();
  bar(const bar&);
  bar(bar&&);
  bar& operator = (const bar&);
  bar& operator = (bar&&);
  ~bar();
};

bar::bar() = default;
bar::bar(const bar&) = default;
bar::bar(bar&&) = default;
bar& bar::operator = (const bar&) = default;
bar& bar::operator = (bar&&) = default;
bar::~bar() = default;

static_assert(__is_trivial(foo), "foo should be trivial");

static_assert(!__has_trivial_destructor(bar), "bar's destructor isn't trivial");
static_assert(!__has_trivial_constructor(bar),
              "bar's default constructor isn't trivial");
static_assert(!__has_trivial_copy(bar), "bar has no trivial copy");
static_assert(!__has_trivial_assign(bar), "bar has no trivial assign");

void tester() {
  foo f, g(f);
  bar b, c(b);
  f = g;
  b = c;
}

template<typename T> struct S : T {
  constexpr S() = default;
  constexpr S(const S&) = default;
  constexpr S(S&&) = default;
};
struct lit { constexpr lit() {} };
S<lit> s_lit; // ok
S<bar> s_bar; // ok

struct Friends {
  friend S<bar>::S();
  friend S<bar>::S(const S&);
  friend S<bar>::S(S&&);
};