5ab1165531
resolution. There are two sources of problems involving user-defined
conversions that this change eliminates, along with providing simpler
interfaces for checking implicit conversions:
- It eliminates a case of infinite recursion found in Boost.
- It eliminates the search for the constructor needed to copy a temporary
generated by an implicit conversion from overload
resolution. Overload resolution assumes that, if it gets a value
of the parameter's class type (or a derived class thereof), there
is a way to copy if... even if there isn't. We now model this
properly.
llvm-svn: 101680
112 lines
2.2 KiB
C++
112 lines
2.2 KiB
C++
// RUN: %clang_cc1 -fsyntax-only -verify %s
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struct X0 { // expected-note{{candidate}}
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X0(int); // expected-note{{candidate}}
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template<typename T> X0(T); // expected-note {{candidate}}
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template<typename T, typename U> X0(T*, U*); // expected-note {{candidate}}
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// PR4761
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template<typename T> X0() : f0(T::foo) {} // expected-note {{candidate}}
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int f0;
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};
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void accept_X0(X0);
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void test_X0(int i, float f) {
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X0 x0a(i);
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X0 x0b(f);
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X0 x0c = i;
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X0 x0d = f;
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accept_X0(i);
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accept_X0(&i);
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accept_X0(f);
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accept_X0(&f);
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X0 x0e(&i, &f);
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X0 x0f(&f, &i);
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X0 x0g(f, &i); // expected-error{{no matching constructor}}
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}
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template<typename T>
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struct X1 {
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X1(const X1&);
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template<typename U> X1(const X1<U>&);
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};
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template<typename T>
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struct Outer {
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typedef X1<T> A;
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A alloc;
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explicit Outer(const A& a) : alloc(a) { }
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};
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void test_X1(X1<int> xi) {
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Outer<int> oi(xi);
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Outer<float> of(xi);
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}
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// PR4655
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template<class C> struct A {};
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template <> struct A<int>{A(const A<int>&);};
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struct B { A<int> x; B(B& a) : x(a.x) {} };
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struct X2 {
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X2(); // expected-note{{candidate constructor}}
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X2(X2&); // expected-note {{candidate constructor}}
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template<typename T> X2(T);
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};
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X2 test(bool Cond, X2 x2) {
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if (Cond)
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return x2; // okay, uses copy constructor
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return X2(); // expected-error{{no matching constructor}}
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}
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struct X3 {
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template<typename T> X3(T);
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};
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template<> X3::X3(X3); // expected-error{{must pass its first argument by reference}}
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struct X4 {
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X4(); // expected-note{{candidate constructor}}
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~X4();
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X4(X4&); // expected-note {{candidate constructor}}
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template<typename T> X4(const T&, int = 17);
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};
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X4 test_X4(bool Cond, X4 x4) {
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X4 a(x4, 17); // okay, constructor template
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X4 b(x4); // okay, copy constructor
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return X4(); // expected-error{{no matching constructor}}
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}
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// Instantiation of a non-dependent use of a constructor
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struct DefaultCtorHasDefaultArg {
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explicit DefaultCtorHasDefaultArg(int i = 17);
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};
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template<typename T>
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void default_ctor_inst() {
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DefaultCtorHasDefaultArg def;
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}
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template void default_ctor_inst<int>();
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template<typename T>
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struct X5 {
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X5();
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X5(const T &);
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};
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struct X6 {
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template<typename T> X6(T);
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};
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void test_X5_X6() {
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X5<X6> tf;
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X5<X6> tf2(tf);
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}
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