[Bf-blender-cvs] [13afc81f6da] master: BLI: Add MACRO for enum usage in C++
Clément Foucault
noreply at git.blender.org
Sun Jul 26 17:30:01 CEST 2020
Commit: 13afc81f6da69e36b3d503fada0760dc07f607dc
Author: Clément Foucault
Date: Sat Jul 25 18:19:49 2020 +0200
Branches: master
https://developer.blender.org/rB13afc81f6da69e36b3d503fada0760dc07f607dc
BLI: Add MACRO for enum usage in C++
This is handy to add support for enums used in both C and C++
files. This removes the need to typecast each time for every
operation.
Only support bitwise operators for now.
===================================================================
M source/blender/blenlib/BLI_utildefines.h
===================================================================
diff --git a/source/blender/blenlib/BLI_utildefines.h b/source/blender/blenlib/BLI_utildefines.h
index bc35e969e6a..2699f2498ac 100644
--- a/source/blender/blenlib/BLI_utildefines.h
+++ b/source/blender/blenlib/BLI_utildefines.h
@@ -754,6 +754,43 @@ extern bool BLI_memory_is_zero(const void *arr, const size_t arr_size);
/** \} */
+/* -------------------------------------------------------------------- */
+/** \name C++ Macros
+ * \{ */
+
+#ifdef __cplusplus
+
+/* Useful to port C code using enums to C++ where enums are strongly typed.
+ * To use after the enum declaration. */
+# define ENUM_OPERATORS(_enum_type) \
+ inline constexpr _enum_type operator|(_enum_type a, _enum_type b) \
+ { \
+ return a = static_cast<_enum_type>(static_cast<int>(a) | b); \
+ } \
+ inline constexpr _enum_type operator&(_enum_type a, _enum_type b) \
+ { \
+ return a = static_cast<_enum_type>(static_cast<int>(a) & b); \
+ } \
+ inline constexpr _enum_type operator~(_enum_type a) \
+ { \
+ return a = static_cast<_enum_type>(~static_cast<int>(a)); \
+ } \
+ inline _enum_type &operator|=(_enum_type &a, _enum_type b) \
+ { \
+ return a = static_cast<_enum_type>(static_cast<int>(a) | b); \
+ } \
+ inline _enum_type &operator&=(_enum_type &a, _enum_type b) \
+ { \
+ return a = static_cast<_enum_type>(static_cast<int>(a) & b); \
+ }
+
+#else
+/* Output nothing. */
+# define ENUM_OPERATORS(_type)
+#endif
+
+/** \} */
+
/* -------------------------------------------------------------------- */
/** \name Misc Macros
* \{ */
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