| /* |
| * Copyright 2018 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| #ifndef SkMacros_DEFINED |
| #define SkMacros_DEFINED |
| |
| #if defined(COBALT) && __cplusplus < 201402L |
| // Cobalt is currently targetting C++11, not C++14. |
| #define CONSTEXPR |
| #else |
| #define CONSTEXPR constexpr |
| #endif |
| |
| /* |
| * Usage: SK_MACRO_CONCAT(a, b) to construct the symbol ab |
| * |
| * SK_MACRO_CONCAT_IMPL_PRIV just exists to make this work. Do not use directly |
| * |
| */ |
| #define SK_MACRO_CONCAT(X, Y) SK_MACRO_CONCAT_IMPL_PRIV(X, Y) |
| #define SK_MACRO_CONCAT_IMPL_PRIV(X, Y) X ## Y |
| |
| /* |
| * Usage: SK_MACRO_APPEND_LINE(foo) to make foo123, where 123 is the current |
| * line number. Easy way to construct |
| * unique names for local functions or |
| * variables. |
| */ |
| #define SK_MACRO_APPEND_LINE(name) SK_MACRO_CONCAT(name, __LINE__) |
| |
| /** |
| * For some classes, it's almost always an error to instantiate one without a name, e.g. |
| * { |
| * SkAutoMutexAcquire(&mutex); |
| * <some code> |
| * } |
| * In this case, the writer meant to hold mutex while the rest of the code in the block runs, |
| * but instead the mutex is acquired and then immediately released. The correct usage is |
| * { |
| * SkAutoMutexAcquire lock(&mutex); |
| * <some code> |
| * } |
| * |
| * To prevent callers from instantiating your class without a name, use SK_REQUIRE_LOCAL_VAR |
| * like this: |
| * class classname { |
| * <your class> |
| * }; |
| * #define classname(...) SK_REQUIRE_LOCAL_VAR(classname) |
| * |
| * This won't work with templates, and you must inline the class' constructors and destructors. |
| * Take a look at SkAutoFree and SkAutoMalloc in this file for examples. |
| */ |
| #define SK_REQUIRE_LOCAL_VAR(classname) \ |
| static_assert(false, "missing name for " #classname) |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| |
| // Can be used to bracket data types that must be dense, e.g. hash keys. |
| #if defined(__clang__) // This should work on GCC too, but GCC diagnostic pop didn't seem to work! |
| #define SK_BEGIN_REQUIRE_DENSE _Pragma("GCC diagnostic push") \ |
| _Pragma("GCC diagnostic error \"-Wpadded\"") |
| #define SK_END_REQUIRE_DENSE _Pragma("GCC diagnostic pop") |
| #else |
| #define SK_BEGIN_REQUIRE_DENSE |
| #define SK_END_REQUIRE_DENSE |
| #endif |
| |
| #define SK_INIT_TO_AVOID_WARNING = 0 |
| |
| #endif // SkMacros_DEFINED |
