return.cpp
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// RUN: %clang_cc1 %s -std=c++11 -fcxx-exceptions -fexceptions -fsyntax-only -Wignored-qualifiers -verify
int test1() {
throw;
}
// PR5071
template<typename T> T f() { }
template<typename T>
void g(T t) {
return t * 2; // okay
}
template<typename T>
T h() {
return 17;
}
// Don't warn on cv-qualified class return types, only scalar return types.
namespace ignored_quals {
struct S {};
const S class_c();
const volatile S class_cv();
const int scalar_c(); // expected-warning{{'const' type qualifier on return type has no effect}}
int const scalar_c2(); // expected-warning{{'const' type qualifier on return type has no effect}}
const
char*
const // expected-warning{{'const' type qualifier on return type has no effect}}
f();
char
const*
const // expected-warning{{'const' type qualifier on return type has no effect}}
g();
char* const h(); // expected-warning{{'const' type qualifier on return type has no effect}}
char* volatile i(); // expected-warning{{'volatile' type qualifier on return type has no effect}}
char*
volatile // expected-warning{{'const volatile' type qualifiers on return type have no effect}}
const
j();
const volatile int scalar_cv(); // expected-warning{{'const volatile' type qualifiers on return type have no effect}}
// FIXME: Maintain enough information that we can point the diagnostic at the 'volatile' keyword.
const
int S::*
volatile
mixed_ret(); // expected-warning {{'volatile' type qualifier on return type has no effect}}
const int volatile // expected-warning {{'const volatile' type qualifiers on return type have no effect}}
(((parens())));
_Atomic(int) atomic();
_Atomic // expected-warning {{'_Atomic' type qualifier on return type has no effect}}
int
atomic();
auto
trailing_return_type() -> // expected-warning {{'const' type qualifier on return type has no effect}}
const int;
const int ret_array()[4]; // expected-error {{cannot return array}}
}
namespace PR9328 {
typedef char *PCHAR;
class Test
{
const PCHAR GetName() { return 0; } // expected-warning{{'const' type qualifier on return type has no effect}}
};
}
class foo {
operator const int ();
operator int * const ();
};
namespace PR10057 {
struct S {
~S();
};
template <class VarType>
void Test(const VarType& value) {
return S() = value;
}
}
namespace return_has_expr {
struct S {
S() {
return 42; // expected-error {{constructor 'S' should not return a value}}
}
~S() {
return 42; // expected-error {{destructor '~S' should not return a value}}
}
};
}
// rdar://15366494
// pr17759
namespace ctor_returns_void {
void f() {}
struct S {
S() { return f(); } // expected-error {{constructor 'S' must not return void expression}}
~S() { return f(); } // expected-error {{destructor '~S' must not return void expression}}
};
template <typename T> struct ST {
ST() { return f(); } // expected-error {{constructor 'ST<T>' must not return void expression}}
// expected-error@-1 {{constructor 'ST' must not return void expression}}
~ST() { return f(); } // expected-error {{destructor '~ST<T>' must not return void expression}}
// expected-error@-1 {{destructor '~ST' must not return void expression}}
};
ST<int> st; // expected-note {{in instantiation of member function 'ctor_returns_void::ST<int>::ST'}}
// expected-note@-1 {{in instantiation of member function 'ctor_returns_void::ST<int>::~ST'}}
}
void cxx_unresolved_expr() {
// The use of an undeclared variable tricks clang into building a
// CXXUnresolvedConstructExpr, and the missing ')' gives it an invalid source
// location for its rparen. Check that emitting a diag on the range of the
// expr doesn't assert.
return int(undeclared, 4; // expected-error {{expected ')'}} expected-note{{to match this '('}} expected-error {{use of undeclared identifier 'undeclared'}}
}