File: ackermann.cpp

package info (click to toggle)
llvm-toolchain-20 1%3A20.1.8-1~exp1
  • links: PTS, VCS
  • area: main
  • in suites: experimental
  • size: 2,111,388 kB
  • sloc: cpp: 7,438,767; ansic: 1,393,871; asm: 1,012,926; python: 241,728; f90: 86,635; objc: 75,411; lisp: 42,144; pascal: 17,286; sh: 10,027; ml: 5,082; perl: 4,730; awk: 3,523; makefile: 3,349; javascript: 2,251; xml: 892; fortran: 672
file content (39 lines) | stat: -rw-r--r-- 717 bytes parent folder | download | duplicates (44) 
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
 
// RUN: %clang_cc1 -fsyntax-only -verify %s
// expected-no-diagnostics

// template<unsigned M, unsigned N>
// struct Ackermann {
//   enum {
//     value = M ? (N ? Ackermann<M-1, Ackermann<M, N-1> >::value
//                    : Ackermann<M-1, 1>::value)
//               : N + 1
//   };
// };

template<unsigned M, unsigned N>
struct Ackermann {
 enum {
   value = Ackermann<M-1, Ackermann<M, N-1>::value >::value
 };
};

template<unsigned M> struct Ackermann<M, 0> {
 enum {
   value = Ackermann<M-1, 1>::value
 };
};

template<unsigned N> struct Ackermann<0, N> {
 enum {
   value = N + 1
 };
};

template<> struct Ackermann<0, 0> {
 enum {
   value = 1
 };
};

int g0[Ackermann<3, 4>::value == 125 ? 1 : -1];