40 lines
1.4 KiB
C++
40 lines
1.4 KiB
C++
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// RUN: %clang_cc1 -std=c++14 -fsyntax-only -verify %s
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template <class> auto fn0 = [] {};
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template <typename> void foo0() { fn0<char>(); }
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template<typename T> auto fn1 = [](auto a) { return a + T(1); };
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template<typename T> auto v1 = [](int a = T()) { return a; }();
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// expected-error@-1{{cannot initialize a parameter of type 'int' with an rvalue of type 'int *'}}
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// expected-note@-2{{passing argument to parameter 'a' here}}
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struct S {
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template<class T>
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static constexpr T t = [](int f = T(7)){return f;}(); // expected-error{{constexpr variable 't<int>' must be initialized by a constant expression}} expected-note{{cannot be used in a constant expression}}
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};
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template <typename X>
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int foo2() {
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X a = 0x61;
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fn1<char>(a);
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(void)v1<int>;
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(void)v1<int *>; // expected-note{{in instantiation of variable template specialization 'v1' requested here}}
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(void)S::t<int>; // expected-note{{in instantiation of static data member 'S::t<int>' requested here}}
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return 0;
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}
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template<class C>
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int foo3() {
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C::m1(); // expected-error{{type 'long long' cannot be used prior to '::' because it has no members}}
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return 1;
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}
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template<class C>
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auto v2 = [](int a = foo3<C>()){}; // expected-note{{in instantiation of function template specialization 'foo3<long long>' requested here}}
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int main() {
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v2<long long>(); // This line causes foo3<long long> to be instantiated.
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v2<long long>(2); // This line does not.
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foo2<int>();
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}
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