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
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
|
/*
Author: Shane Neph & Scott Kuehn
Date: Thu Nov 29 15:28:17 PST 2007
*/
//
// BEDOPS
// Copyright (C) 2011-2022 Shane Neph, Scott Kuehn and Alex Reynolds
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with this program; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
//
#ifndef TYPIFY_CONSTRUCTIONS_H
#define TYPIFY_CONSTRUCTIONS_H
namespace Ext {
//============
// Int2Type<> : typify an integer
// o good for overloading & specializations purposes
//============
template <int Val>
struct Int2Type {
enum { val = Val };
};
//=============
// Type2Type<> : typify a type
// o lightweight -> good for function overloading purposes
// o does not require template T to be constructible
//=============
template <typename T>
struct Type2Type {
typedef T OriginalType;
};
//============
// has_type<T> : is there a T::type typedef?
// stolen and modified from
// http://stackoverflow.com/questions/25626293/has-type-template-returns-true-for-struct-type
//============
template <typename T>
struct has_type {
template <typename C>
static constexpr
char test_for_type(...) { return '0'; }
template <typename C>
static constexpr
double test_for_type(typename C::type const*) { return 0.0; }
static const bool value = sizeof(test_for_type<T>(0)) == sizeof(double);
};
} // namespace Ext
#endif // TYPIFY_CONSTRUCTIONS_H
|
