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// RUN: %clang_cc1 -fsyntax-only -verify %s
namespace test0 {
template<class T> void apply(T x, void (*f)(T)) { f(x); } // expected-note 2 {{failed template argument deduction}}\
// expected-note {{no overload of 'temp2' matching 'void (*)(int)'}}
template<class A> void temp(A);
void test0() {
// okay: deduce T=int from first argument, A=int during overload
apply(0, &temp);
apply(0, &temp<>);
// okay: deduce T=int from first and second arguments
apply(0, &temp<int>);
// deduction failure: T=int from first, T=long from second
apply(0, &temp<long>); // expected-error {{no matching function for call to 'apply'}}
}
void over(int);
int over(long);
void test1() {
// okay: deductions match
apply(0, &over);
// deduction failure: deduced T=long from first argument, T=int from second
apply(0L, &over); // expected-error {{no matching function for call to 'apply'}}
}
void over(short);
void test2() {
// deduce T=int from first arg, second arg is undeduced context,
// pick correct overload of 'over' during overload resolution for 'apply'
apply(0, &over);
}
template<class A, class B> B temp2(A);
void test3() {
// deduce T=int from first arg, A=int B=void during overload resolution
apply(0, &temp2);
apply(0, &temp2<>);
apply(0, &temp2<int>);
// overload failure
apply(0, &temp2<long>); // expected-error {{no matching function for call to 'apply'}}
}
}
namespace test1 {
template<class T> void invoke(void (*f)(T)) { f(T()); } // expected-note 6 {{couldn't infer template argument}} \
// expected-note {{failed template argument deduction}}
template<class T> void temp(T);
void test0() {
// deduction failure: overload has template => undeduced context
invoke(&temp); // expected-error {{no matching function for call to 'invoke'}}
invoke(&temp<>); // expected-error {{no matching function for call to 'invoke'}}
// okay: full template-id
invoke(&temp<int>);
}
void over(int);
int over(long);
void test1() {
// okay: only one overload matches
invoke(&over);
}
void over(short);
void test2() {
// deduction failure: overload has multiple matches => undeduced context
invoke(&over); // expected-error {{no matching function for call to 'invoke'}}
}
template<class A, class B> B temp2(A);
void test3() {
// deduction failure: overload has template => undeduced context
// (even though partial application temp2<int> could in theory
// let us infer T=int)
invoke(&temp2); // expected-error {{no matching function for call to 'invoke'}}
invoke(&temp2<>); // expected-error {{no matching function for call to 'invoke'}}
invoke(&temp2<int>); // expected-error {{no matching function for call to 'invoke'}}
// okay: full template-id
invoke(&temp2<int, void>);
// overload failure
invoke(&temp2<int, int>); // expected-error {{no matching function for call to 'invoke'}}
}
}
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