gfx/skia/trunk/src/utils/SkTLogic.h@129ffea94266 (annotated)
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.
| michael@0 | 1 | /* |
| michael@0 | 2 | * Copyright 2013 Google Inc. |
| michael@0 | 3 | * |
| michael@0 | 4 | * Use of this source code is governed by a BSD-style license that can be |
| michael@0 | 5 | * found in the LICENSE file. |
| michael@0 | 6 | * |
| michael@0 | 7 | * |
| michael@0 | 8 | * This header provides some of the helpers (std::integral_constant) and |
| michael@0 | 9 | * type transformations (std::conditional) which will become available with |
| michael@0 | 10 | * C++11 in the type_traits header. |
| michael@0 | 11 | * |
| michael@0 | 12 | * Because we lack constexpr, we cannot mimic |
| michael@0 | 13 | * std::integral_constant::'constexpr operator T()'. |
| michael@0 | 14 | * As a result we introduce SkTBool and SkTIf similar to Boost in order to |
| michael@0 | 15 | * minimize the visual noise of many uses of '::value'. |
| michael@0 | 16 | */ |
| michael@0 | 17 | |
| michael@0 | 18 | #ifndef SkTLogic_DEFINED |
| michael@0 | 19 | #define SkTLogic_DEFINED |
| michael@0 | 20 | |
| michael@0 | 21 | /** Represents a templated integer constant. |
| michael@0 | 22 | * Pre-C++11 version of std::integral_constant. |
| michael@0 | 23 | */ |
| michael@0 | 24 | template <typename T, T v> struct SkTIntegralConstant { |
| michael@0 | 25 | static const T value = v; |
| michael@0 | 26 | typedef T value_type; |
| michael@0 | 27 | typedef SkTIntegralConstant<T, v> type; |
| michael@0 | 28 | }; |
| michael@0 | 29 | |
| michael@0 | 30 | /** Convenience specialization of SkTIntegralConstant. */ |
| michael@0 | 31 | template <bool b> struct SkTBool : SkTIntegralConstant<bool, b> { }; |
| michael@0 | 32 | |
| michael@0 | 33 | /** Pre-C++11 version of std::true_type. */ |
| michael@0 | 34 | typedef SkTBool<true> SkTrue; |
| michael@0 | 35 | |
| michael@0 | 36 | /** Pre-C++11 version of std::false_type. */ |
| michael@0 | 37 | typedef SkTBool<false> SkFalse; |
| michael@0 | 38 | |
| michael@0 | 39 | /** SkTIf_c::type = (condition) ? T : F; |
| michael@0 | 40 | * Pre-C++11 version of std::conditional. |
| michael@0 | 41 | */ |
| michael@0 | 42 | template <bool condition, typename T, typename F> struct SkTIf_c { |
| michael@0 | 43 | typedef F type; |
| michael@0 | 44 | }; |
| michael@0 | 45 | template <typename T, typename F> struct SkTIf_c<true, T, F> { |
| michael@0 | 46 | typedef T type; |
| michael@0 | 47 | }; |
| michael@0 | 48 | |
| michael@0 | 49 | /** SkTIf::type = (Condition::value) ? T : F; */ |
| michael@0 | 50 | template <typename Condition, typename T, typename F> struct SkTIf { |
| michael@0 | 51 | typedef typename SkTIf_c<static_cast<bool>(Condition::value), T, F>::type type; |
| michael@0 | 52 | }; |
| michael@0 | 53 | |
| michael@0 | 54 | /** SkTMux::type = (a && b) ? Both : (a) ? A : (b) ? B : Neither; */ |
| michael@0 | 55 | template <typename a, typename b, typename Both, typename A, typename B, typename Neither> |
| michael@0 | 56 | struct SkTMux { |
| michael@0 | 57 | typedef typename SkTIf<a, typename SkTIf<b, Both, A>::type, |
| michael@0 | 58 | typename SkTIf<b, B, Neither>::type>::type type; |
| michael@0 | 59 | }; |
| michael@0 | 60 | |
| michael@0 | 61 | #endif |
