[core] Move ignore.hpp to public include directory

1 files changed, 26 insertions, 0 deletions

diff --git a/include/mbgl/util/ignore.hpp b/include/mbgl/util/ignore.hpp
new file mode 100644
index 0000000000..577bcf4d91
--- /dev/null
+++ b/include/mbgl/util/ignore.hpp
@@ -0,0 +1,26 @@
+#pragma once
+
+#include <initializer_list>
+
+namespace mbgl {
+namespace util {
+
+// Accept any number of parameters of any types, and do nothing with them.
+// Useful for providing a context for parameter pack expansion where a legal
+// expansion context is not otherwise available.
+//
+// See https://github.com/mapbox/cpp/blob/master/C%2B%2B%20Structural%20Metaprogramming.md
+// for more details.
+//
+template <class... Ts> void ignore(Ts&&...) {}
+
+// std::initializer_list overload, for situations where you need sequenced
+// modifications.
+//
+template <class T> void ignore(const std::initializer_list<T>&) {}
+
+// Handle the zero-argument case.
+inline void ignore(const std::initializer_list<int>&) {}
+
+} // namespace util
+} // namespace mbgl