File: instantiate-scope.cpp

package info (click to toggle)
llvm-toolchain-15 1%3A15.0.6-4
  • links: PTS, VCS
  • area: main
  • in suites: bookworm
  • size: 1,554,644 kB
  • sloc: cpp: 5,922,452; ansic: 1,012,136; asm: 674,362; python: 191,568; objc: 73,855; f90: 42,327; lisp: 31,913; pascal: 11,973; javascript: 10,144; sh: 9,421; perl: 7,447; ml: 5,527; awk: 3,523; makefile: 2,520; xml: 885; cs: 573; fortran: 567
file content (30 lines) | stat: -rw-r--r-- 852 bytes parent folder | download | duplicates (35) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
 
// RUN: %clang_cc1 -std=c++11 -verify %s

template<typename ...T> struct X {
  void f(int);
  void f(...);
  static int n;
};

template<typename T, typename U> using A = T;

// These definitions are OK, X<A<T, decltype(...)>...> is equivalent to X<T...>
// so this defines the member of the primary template.
template<typename ...T>
void X<A<T, decltype(f(T()))>...>::f(int) {} // expected-error {{undeclared}}

template<typename ...T>
int X<A<T, decltype(f(T()))>...>::n = 0; // expected-error {{undeclared}}

struct Y {}; void f(Y);

void g() {
  // OK, substitution succeeds.
  X<Y>().f(0);
  X<Y>::n = 1;

  // Error, substitution fails; this should not be treated as a SFINAE-able
  // condition, so we don't select X<void>::f(...).
  X<void>().f(0); // expected-note {{instantiation of}}
  X<void>::n = 1; // expected-note {{instantiation of}}
}