[core] Bitmask operations for enums

1 files changed, 33 insertions, 0 deletions

diff --git a/include/mbgl/util/bitmask_operations.hpp b/include/mbgl/util/bitmask_operations.hpp
new file mode 100644
index 0000000000..014fabdea2
--- /dev/null
+++ b/include/mbgl/util/bitmask_operations.hpp
@@ -0,0 +1,33 @@
+#pragma once
+
+#include <mbgl/util/traits.hpp>
+#include <mbgl/util/util.hpp>
+
+namespace mbgl {
+
+template<typename Enum>
+MBGL_CONSTEXPR Enum operator|(Enum a, Enum b) {
+    static_assert(std::is_enum<Enum>::value, "Enum must be an enum type");
+    return Enum(mbgl::underlying_type(a) | mbgl::underlying_type(b));
+}
+
+template<typename Enum>
+MBGL_CONSTEXPR Enum& operator|=(Enum& a, Enum b) {
+    static_assert(std::is_enum<Enum>::value, "Enum must be an enum type");
+    return (a = a | b);
+}
+
+template<typename Enum>
+MBGL_CONSTEXPR bool operator&(Enum a, Enum b) {
+    static_assert(std::is_enum<Enum>::value, "Enum must be an enum type");
+    return bool(mbgl::underlying_type(a) & mbgl::underlying_type(b));
+}
+
+template<typename Enum>
+MBGL_CONSTEXPR Enum operator~(Enum value) {
+    static_assert(std::is_enum<Enum>::value, "Enum must be an enum type");
+    return Enum(~mbgl::underlying_type(value));
+}
+
+
+} // namespace mbgl
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