File: decltype19.C

package info (click to toggle)
gcc-arm-none-eabi 15%3A7-2018-q2-5
  • links: PTS, VCS
  • area: main
  • in suites: buster
  • size: 539,188 kB
  • sloc: ansic: 2,739,935; cpp: 848,238; ada: 602,637; makefile: 62,919; asm: 55,635; xml: 46,238; exp: 23,020; sh: 19,616; python: 6,371; pascal: 3,889; awk: 3,278; perl: 2,691; yacc: 316; ml: 285; f90: 234; lex: 198; objc: 194; haskell: 119
file content (24 lines) | stat: -rw-r--r-- 570 bytes parent folder | download | duplicates (10) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
 
// PR c++/42013

template<typename _Tp>
  _Tp
__attribute ((const)) declval();

template<typename _Tp, typename _Up>
  struct common_type
  {
    typedef __decltype(true  ? declval<_Tp>() : declval<_Up>()) typet;
    typedef __decltype(false ? declval<_Tp>() : declval<_Up>()) typef;
  };

template<typename, typename> struct is_same;

template<typename _Tp> struct is_same<_Tp, _Tp> { typedef _Tp type; };

void f()
{
  typedef common_type<int, const int>::typet typet;
  typedef common_type<int, const int>::typef typef;

  typedef is_same<typet, typef>::type type;
}