File: variadic-nondeduce2.C

package info (click to toggle)
gcc-arm-none-eabi 15%3A12.2.rel1-1
  • links: PTS, VCS
  • area: main
  • in suites: bookworm
  • size: 959,712 kB
  • sloc: cpp: 3,275,382; ansic: 2,061,766; ada: 840,956; f90: 208,513; makefile: 76,132; asm: 73,433; xml: 50,448; exp: 34,146; sh: 32,436; objc: 15,637; fortran: 14,012; python: 11,991; pascal: 6,787; awk: 4,779; perl: 3,054; yacc: 338; ml: 285; lex: 201; haskell: 122
file content (25 lines) | stat: -rw-r--r-- 654 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
25
 
// PR c++/55220
// { dg-do compile { target c++11 } }

template <typename ...> struct something_like_tuple
{

};

template <typename, typename> struct is_last
{
  static const bool value = false;
};

// Head is non-deducible, so this can't work as the user intended
template <typename T, template <typename ...> class Tuple, typename ... Head>
struct is_last<T, Tuple<Head ..., T>>
{
  static const bool value = true;
};

#define SA(X) static_assert (X, #X)

typedef something_like_tuple<char, int, float> something_like_tuple_t;
SA ((is_last<float, something_like_tuple_t>::value == false));
SA ((is_last<int, something_like_tuple_t>::value == false));