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