Parsing, ASTs, and semantic analysis for the declaration of conversion

functions in C++, e.g.,

  struct X {
    operator bool() const;
  };

Note that these conversions don't actually do anything, since we don't
yet have the ability to use them for implicit or explicit conversions.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@58860 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 42 insertions, 0 deletions

diff --git a/test/SemaCXX/conversion-function.cpp b/test/SemaCXX/conversion-function.cpp
new file mode 100644
index 0000000000..3c96e54c53
--- /dev/null
+++ b/test/SemaCXX/conversion-function.cpp
@@ -0,0 +1,42 @@
+// RUN: clang -fsyntax-only -verify %s 
+class X { 
+public:
+  operator bool();
+  operator int() const;
+};
+
+operator int(); // expected-error{{conversion function must be a non-static member function}}
+
+typedef int func_type(int);
+typedef int array_type[10];
+
+class Y {
+public:
+  void operator bool(int, ...) const; // expected-error{{conversion function cannot have a return type}} \
+  // expected-error{{conversion function cannot have any parameters}} \
+  // expected-error{{conversion function cannot be variadic}}
+  operator func_type(); // expected-error{{conversion function cannot convert to a function type}}
+  operator array_type(); // expected-error{{conversion function cannot convert to an array type}}
+};
+
+
+typedef int INT;
+typedef INT* INT_PTR;
+
+class Z { 
+  operator int(); // expected-error{{previous declaration is here}}
+  operator int**(); // expected-error{{previous declaration is here}}
+  
+  operator INT();  // expected-error{{conversion function cannot be redeclared}}
+  operator INT_PTR*(); // expected-error{{conversion function cannot be redeclared}}
+};
+
+
+class A { };
+
+class B : public A {
+public:
+  operator A&() const; // expected-warning{{conversion function converting 'class B' to its base class 'class A' will never be used}}
+  operator const void() const; // expected-warning{{conversion function converting 'class B' to 'void const' will never be used}}
+  operator const B(); // expected-warning{{conversion function converting 'class B' to itself will never be used}}
+};