clang/test/SemaCXX/default1.cpp

// RUN: %clang_cc1 -fsyntax-only -verify %s
// RUN: %clang_cc1 -fsyntax-only -verify -std=c++98 %s
// RUN: %clang_cc1 -fsyntax-only -verify -std=c++11 %s

void f(int i);
void f(int i = 0); // expected-note {{previous definition is here}}
void f(int i = 17); // expected-error {{redefinition of default argument}}


void g(int i, int j, int k = 3);
void g(int i, int j = 2, int k);
void g(int i = 1, int j, int k);

void h(int i, int j = 2, int k = 3, 
       int l, // expected-error {{missing default argument on parameter 'l'}}
       int,   // expected-error {{missing default argument on parameter}}
       int n);// expected-error {{missing default argument on parameter 'n'}}

struct S { } s;
void i(int = s) { } // expected-error {{no viable conversion}} \
// expected-note{{passing argument to parameter here}}

struct X { 
  X(int);
};

void j(X x = 17); // expected-note{{'::j' declared here}}

struct Y { // expected-note 2{{candidate constructor (the implicit copy constructor) not viable}}
#if __cplusplus >= 201103L // C++11 or later
// expected-note@-2 2 {{candidate constructor (the implicit move constructor) not viable}}
#endif

  explicit Y(int); // expected-note 2{{explicit constructor is not a candidate}}
};

void k(Y y = 17); // expected-error{{no viable conversion}} \
// expected-note{{passing argument to parameter 'y' here}}

void kk(Y = 17); // expected-error{{no viable conversion}} \
// expected-note{{passing argument to parameter here}}

int l () {
  int m(int i, int j, int k = 3);
  if (1)
  {
    int m(int i, int j = 2, int k = 4);
    m(8);
  }
  return 0;
}

int i () {
  void j (int f = 4);
  {
    void j (int f);
    j(); // expected-error{{too few arguments to function call, expected 1, have 0; did you mean '::j'?}}
  }
  void jj (int f = 4);
  {
    void jj (int f); // expected-note{{'jj' declared here}}
    jj(); // expected-error{{too few arguments to function call, single argument 'f' was not specified}}
  }
}

int i2() {
  void j(int f = 4); // expected-note{{'j' declared here}}
  {
    j(2, 3); // expected-error{{too many arguments to function call, expected at most single argument 'f', have 2}}
  }
}

int pr20055_f(int x = 0, int y = UNDEFINED); // expected-error{{use of undeclared identifier}}
int pr20055_v = pr20055_f(0);

void PR20769() { void PR20769(int = 1); }
void PR20769(int = 2);

void PR20769_b(int = 1);
void PR20769_b() { void PR20769_b(int = 2); }

#if __cplusplus >= 201103L
template<typename T> constexpr int f1() { return 0; }
// This is OK, but in order to see that we must instantiate f<int>, despite it
// being in an unused default argument.
void g1(char c = {f1<int>()}) {} // expected-warning {{braces around scalar}}

// This is formally ill-formed, but we choose to not trigger instantiation here
// (at least, not until g2 is actually called in a way that uses the default
// argument).
template<typename T> int f2() { return T::error; }
void g2(int c = f2<int>()) {}

// FIXME: Provide a note pointing at the first use of the default argument?
template<typename T> int f3() { return T::error; } // expected-error {{no members}}
void g3(int c = f3<int>()) {} // expected-note {{in instantiation of}}
void use_g3() { g3(); }

namespace PR47682 {
  inline namespace A {
    void f(int = 0);
  }
}
void PR47682::f(int) {}
void PR47682_test() { PR47682::f(); }
#endif