gfx/skia/trunk/src/utils/SkTLogic.h@129ffea94266
gfx/skia/trunk/src/utils/SkTLogic.h
Sat, 03 Jan 2015 20:18:00 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Sat, 03 Jan 2015 20:18:00 +0100
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
- permissions
- -rw-r--r--
Conditionally enable double key logic according to:
private browsing mode or privacy.thirdparty.isolate preference and
implement in GetCookieStringCommon and FindCookie where it counts...
With some reservations of how to convince FindCookie users to test
condition and pass a nullptr when disabling double key logic.
1 /*
2 * Copyright 2013 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 *
7 *
8 * This header provides some of the helpers (std::integral_constant) and
9 * type transformations (std::conditional) which will become available with
10 * C++11 in the type_traits header.
11 *
12 * Because we lack constexpr, we cannot mimic
13 * std::integral_constant::'constexpr operator T()'.
14 * As a result we introduce SkTBool and SkTIf similar to Boost in order to
15 * minimize the visual noise of many uses of '::value'.
16 */
18 #ifndef SkTLogic_DEFINED
19 #define SkTLogic_DEFINED
21 /** Represents a templated integer constant.
22 * Pre-C++11 version of std::integral_constant.
23 */
24 template <typename T, T v> struct SkTIntegralConstant {
25 static const T value = v;
26 typedef T value_type;
27 typedef SkTIntegralConstant<T, v> type;
28 };
30 /** Convenience specialization of SkTIntegralConstant. */
31 template <bool b> struct SkTBool : SkTIntegralConstant<bool, b> { };
33 /** Pre-C++11 version of std::true_type. */
34 typedef SkTBool<true> SkTrue;
36 /** Pre-C++11 version of std::false_type. */
37 typedef SkTBool<false> SkFalse;
39 /** SkTIf_c::type = (condition) ? T : F;
40 * Pre-C++11 version of std::conditional.
41 */
42 template <bool condition, typename T, typename F> struct SkTIf_c {
43 typedef F type;
44 };
45 template <typename T, typename F> struct SkTIf_c<true, T, F> {
46 typedef T type;
47 };
49 /** SkTIf::type = (Condition::value) ? T : F; */
50 template <typename Condition, typename T, typename F> struct SkTIf {
51 typedef typename SkTIf_c<static_cast<bool>(Condition::value), T, F>::type type;
52 };
54 /** SkTMux::type = (a && b) ? Both : (a) ? A : (b) ? B : Neither; */
55 template <typename a, typename b, typename Both, typename A, typename B, typename Neither>
56 struct SkTMux {
57 typedef typename SkTIf<a, typename SkTIf<b, Both, A>::type,
58 typename SkTIf<b, B, Neither>::type>::type type;
59 };
61 #endif
