File: sfinae-1.cpp

package info (click to toggle)
swiftlang 6.0.3-2
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid, trixie
  • size: 2,519,992 kB
  • sloc: cpp: 9,107,863; ansic: 2,040,022; asm: 1,135,751; python: 296,500; objc: 82,456; f90: 60,502; lisp: 34,951; pascal: 19,946; sh: 18,133; perl: 7,482; ml: 4,937; javascript: 4,117; makefile: 3,840; awk: 3,535; xml: 914; fortran: 619; cs: 573; ruby: 573
file content (43 lines) | stat: -rw-r--r-- 919 bytes parent folder | download | duplicates (40) 
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
31
32
33
34
35
36
37
38
39
40
41
42
43
 
// RUN: %clang_cc1 -verify %s
// expected-no-diagnostics

typedef char one_byte;
struct two_bytes { char data[2]; };

template<typename T> one_byte __is_class_check(int T::*);
template<typename T> two_bytes __is_class_check(...);

template<typename T> struct is_class {
  static const bool value = sizeof(__is_class_check<T>(0)) == 1;
};

struct X { };

int array0[is_class<X>::value? 1 : -1];
int array1[is_class<int>::value? -1 : 1];
int array2[is_class<char[3]>::value? -1 : 1];

namespace instantiation_order1 {
  template<typename T>
  struct it_is_a_trap { 
    typedef typename T::trap type;
  };

  template<bool, typename T = void>
  struct enable_if {
    typedef T type;
  };

  template<typename T>
  struct enable_if<false, T> { };

  template<typename T>
  typename enable_if<sizeof(T) == 17>::type 
  f(const T&, typename it_is_a_trap<T>::type* = 0);

  void f(...);

  void test_f() {
    f('a');
  }
}