[build] vendor std::expected polyfill

1 files changed, 16 insertions, 0 deletions

diff --git a/include/mbgl/util/expected.hpp b/include/mbgl/util/expected.hpp
new file mode 100644
index 0000000000..a45f071065
--- /dev/null
+++ b/include/mbgl/util/expected.hpp
@@ -0,0 +1,16 @@
+#pragma once
+
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wshadow"
+#include <expected.hpp>
+#pragma GCC diagnostic pop
+
+namespace mbgl {
+
+template <class T, class E>
+using expected = nonstd::expected<T, E>;
+
+template <class E>
+using unexpected = nonstd::unexpected_type<E>;
+
+} // namespace mbgl