1 /*
2 * Copyright (c) 2010, Michael Lehn
3 *
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1) Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2) Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in
14 * the documentation and/or other materials provided with the
15 * distribution.
16 * 3) Neither the name of the FLENS development group nor the names of
17 * its contributors may be used to endorse or promote products derived
18 * from this software without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
23 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
24 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
25 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
26 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
30 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 */
32
33 #ifndef FLENS_AUX_PROMOTION_H
34 #define FLENS_AUX_PROMOTION_H 1
35
36 #include <flens/aux/ifelseif.h>
37 #include <flens/aux/isconvertible.h>
38
39 namespace flens {
40
41 template <typename A, typename B>
42 struct Promotion
43 {
44 typedef typename IfElseIf<sizeof(B)<=sizeof(A), A,
45 sizeof(A)<=sizeof(B), B>::Type Type;
46 };
47
48 template <typename A>
49 struct Promotion<A, A>
50 {
51 typedef A Type;
52 };
53
54 //-- int, float ----------------------------------------------------------------
55 template <>
56 struct Promotion<int, float>
57 {
58 typedef float Type;
59 };
60
61 template <>
62 struct Promotion<float, int>
63 {
64 typedef float Type;
65 };
66
67 //-- long, float ----------------------------------------------------------------
68 template <>
69 struct Promotion<long, float>
70 {
71 typedef float Type;
72 };
73
74 template <>
75 struct Promotion<float, long>
76 {
77 typedef float Type;
78 };
79
80 //-- int, double ---------------------------------------------------------------
81 template <>
82 struct Promotion<int, double>
83 {
84 typedef double Type;
85 };
86
87 template <>
88 struct Promotion<double, int>
89 {
90 typedef double Type;
91 };
92
93 //-- long, double ---------------------------------------------------------------
94 template <>
95 struct Promotion<long, double>
96 {
97 typedef double Type;
98 };
99
100 template <>
101 struct Promotion<double, long>
102 {
103 typedef double Type;
104 };
105
106 } // namespace flens
107
108 #endif // FLENS_AUX_PROMOTION_H
2 * Copyright (c) 2010, Michael Lehn
3 *
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1) Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2) Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in
14 * the documentation and/or other materials provided with the
15 * distribution.
16 * 3) Neither the name of the FLENS development group nor the names of
17 * its contributors may be used to endorse or promote products derived
18 * from this software without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
23 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
24 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
25 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
26 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
30 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 */
32
33 #ifndef FLENS_AUX_PROMOTION_H
34 #define FLENS_AUX_PROMOTION_H 1
35
36 #include <flens/aux/ifelseif.h>
37 #include <flens/aux/isconvertible.h>
38
39 namespace flens {
40
41 template <typename A, typename B>
42 struct Promotion
43 {
44 typedef typename IfElseIf<sizeof(B)<=sizeof(A), A,
45 sizeof(A)<=sizeof(B), B>::Type Type;
46 };
47
48 template <typename A>
49 struct Promotion<A, A>
50 {
51 typedef A Type;
52 };
53
54 //-- int, float ----------------------------------------------------------------
55 template <>
56 struct Promotion<int, float>
57 {
58 typedef float Type;
59 };
60
61 template <>
62 struct Promotion<float, int>
63 {
64 typedef float Type;
65 };
66
67 //-- long, float ----------------------------------------------------------------
68 template <>
69 struct Promotion<long, float>
70 {
71 typedef float Type;
72 };
73
74 template <>
75 struct Promotion<float, long>
76 {
77 typedef float Type;
78 };
79
80 //-- int, double ---------------------------------------------------------------
81 template <>
82 struct Promotion<int, double>
83 {
84 typedef double Type;
85 };
86
87 template <>
88 struct Promotion<double, int>
89 {
90 typedef double Type;
91 };
92
93 //-- long, double ---------------------------------------------------------------
94 template <>
95 struct Promotion<long, double>
96 {
97 typedef double Type;
98 };
99
100 template <>
101 struct Promotion<double, long>
102 {
103 typedef double Type;
104 };
105
106 } // namespace flens
107
108 #endif // FLENS_AUX_PROMOTION_H