1 // The Art of C++ / Sequences
2 // Copyright (c) 2015 Daniel Frey
3 
4 #ifndef TAOCPP_SEQUENCES_INCLUDE_IS_ALL_HPP
5 #define TAOCPP_SEQUENCES_INCLUDE_IS_ALL_HPP
6 
7 #include "config.hpp"
8 
9 #ifndef TAOCPP_FOLD_EXPRESSIONS
10 #include "integer_sequence.hpp"
11 #endif
12 
13 #include <type_traits>
14 
15 namespace tao
16 {
17   namespace seq
18   {
19 
20 #ifdef TAOCPP_FOLD_EXPRESSIONS
21 
22     template< bool... Bs >
23     using is_all = std::integral_constant< bool, ( Bs && ... ) >;
24 
25 #else
26 
27     template< bool... Bs >
28     using is_all = std::integral_constant< bool, std::is_same< integer_sequence< bool, true, Bs... >, integer_sequence< bool, Bs..., true > >::value >;
29 
30 #endif
31 
32   }
33 }
34 
35 #endif // TAOCPP_SEQUENCES_INCLUDE_IS_ALL_HPP
36