Merge branch 'master' of ssh://bitbucket.org/czan/honours

1 files changed, 77 insertions, 0 deletions

diff --git a/clang/test/CXX/dcl.decl/dcl.init/dcl.init.ref/p5-cxx03-extra-copy.cpp b/clang/test/CXX/dcl.decl/dcl.init/dcl.init.ref/p5-cxx03-extra-copy.cpp
new file mode 100644
index 0000000..d58a129
--- /dev/null
+++ b/clang/test/CXX/dcl.decl/dcl.init/dcl.init.ref/p5-cxx03-extra-copy.cpp
@@ -0,0 +1,77 @@
+// RUN: %clang_cc1 -fsyntax-only -fdiagnostics-show-option -verify %s
+
+// C++03 requires that we check for a copy constructor when binding a
+// reference to a temporary, since we are allowed to make a copy, Even
+// though we don't actually make that copy, make sure that we diagnose
+// cases where that copy constructor is somehow unavailable.  As an
+// extension, this is only a warning.
+
+struct X1 {
+  X1();
+  explicit X1(const X1&);
+};
+
+struct X2 {
+  X2();
+
+private:
+  X2(const X2&); // expected-note{{declared private here}}
+};
+
+struct X3 {
+  X3();
+
+private:
+  X3(X3&); // expected-note{{candidate constructor not viable: no known conversion from 'X3' to 'X3 &' for 1st argument}}
+};
+
+// Check for instantiation of default arguments
+template<typename T>
+T get_value_badly() {
+  double *dp = 0;
+  // The extension doesn't extend far enough to turn this error into a warning.
+  T *tp = dp; // expected-error{{cannot initialize a variable of type 'int *' with an lvalue of type 'double *'}}
+  return T();
+}
+
+template<typename T>
+struct X4 {
+  X4();
+  X4(const X4&, T = get_value_badly<T>()); // expected-note{{in instantiation of}}
+}; 
+
+// Check for "dangerous" default arguments that could cause recursion.
+struct X5 {
+  X5();
+  X5(const X5&, const X5& = X5()); // expected-warning{{no viable constructor copying parameter of type 'X5'}}
+};
+
+void g1(const X1&);
+void g2(const X2&);
+void g3(const X3&);
+void g4(const X4<int>&);
+void g5(const X5&);
+
+void test() {
+  g1(X1());
+  g2(X2()); // expected-warning{{C++98 requires an accessible copy constructor for class 'X2' when binding a reference to a temporary; was private}}
+  g3(X3()); // expected-warning{{no viable constructor copying parameter of type 'X3'}}
+  g4(X4<int>());
+  g5(X5());  // Generates a warning in the default argument.
+}
+
+// Check that unavailable copy constructors still cause SFINAE failures.
+template<int> struct int_c { };
+
+template<typename T> T f(const T&);
+
+// Would be ambiguous with the next g(), except the instantiation failure in
+// sizeof() prevents that.
+template<typename T>
+int &g(int_c<sizeof(f(T()))> * = 0);
+
+template<typename T> float &g();
+
+void h() {
+  float &fp2 = g<X3>();  // Not ambiguous.
+}