You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
54 lines
2.8 KiB
54 lines
2.8 KiB
// RUN: %clang_cc1 -std=c++2a -verify %s
|
|
|
|
// Make sure constraint expressions are unevaluated before being substituted
|
|
// into during satisfaction checking.
|
|
|
|
template<typename T> constexpr bool f = T::value;
|
|
// expected-error@-1 4{{type}}
|
|
|
|
namespace unevaluated {
|
|
template<typename T> concept Foo = false && f<int>;
|
|
bool k = Foo<int>;
|
|
template<typename T> requires false && f<int> struct S {};
|
|
// expected-note@-1{{because}}
|
|
using s = S<int>; // expected-error {{constraints not satisfied}}
|
|
template<typename T> void foo() requires false && f<int> { };
|
|
// expected-note@-1{{because}} expected-note@-1{{candidate template ignored}}
|
|
int a = (foo<int>(), 0); // expected-error{{no matching function}}
|
|
template<typename T> void bar() requires requires { requires false && f<int>; } { };
|
|
// expected-note@-1{{because}} expected-note@-1{{candidate template ignored}}
|
|
int b = (bar<int>(), 0); // expected-error{{no matching function}}
|
|
template<typename T> struct M { static void foo() requires false && f<int> { }; };
|
|
// expected-note@-1{{because}}
|
|
int c = (M<int>::foo(), 0);
|
|
// expected-error@-1{{invalid reference to function 'foo': constraints not satisfied}}
|
|
}
|
|
|
|
namespace constant_evaluated {
|
|
template<typename T> requires f<int[0]> struct S {};
|
|
// expected-note@-1{{in instantiation of}} expected-note@-1{{while substituting}} \
|
|
expected-error@-1{{substitution into constraint expression resulted in a non-constant expression}} \
|
|
expected-note@-1{{subexpression not valid}}
|
|
using s = S<int>;
|
|
// expected-note@-1 2{{while checking}}
|
|
template<typename T> void foo() requires f<int[1]> { };
|
|
// expected-note@-1{{in instantiation}} expected-note@-1{{while substituting}} \
|
|
expected-note@-1{{candidate template ignored}} expected-note@-1{{subexpression not valid}} \
|
|
expected-error@-1{{substitution into constraint expression resulted in a non-constant expression}}
|
|
int a = (foo<int>(), 0);
|
|
// expected-note@-1 2{{while checking}} expected-error@-1{{no matching function}} \
|
|
expected-note@-1 2{{in instantiation}}
|
|
template<typename T> void bar() requires requires { requires f<int[2]>; } { };
|
|
// expected-note@-1{{in instantiation}} expected-note@-1{{subexpression not valid}} \
|
|
expected-note@-1{{while substituting}} \
|
|
expected-error@-1{{substitution into constraint expression resulted in a non-constant expression}} \
|
|
expected-note@-1 2{{while checking the satisfaction of nested requirement}}
|
|
int b = (bar<int>(), 0);
|
|
template<typename T> struct M { static void foo() requires f<int[3]> { }; };
|
|
// expected-note@-1{{in instantiation}} expected-note@-1{{subexpression not valid}} \
|
|
expected-note@-1{{while substituting}} \
|
|
expected-error@-1{{substitution into constraint expression resulted in a non-constant expression}}
|
|
int c = (M<int>::foo(), 0);
|
|
// expected-note@-1 2{{while checking}}
|
|
}
|