[core] GCC 4.9 does not fully support custom variable templates

2 files changed, 7 insertions, 6 deletions

diff --git a/include/mbgl/util/indexed_tuple.hpp b/include/mbgl/util/indexed_tuple.hpp
index a414639530..fd0b931d36 100644
--- a/include/mbgl/util/indexed_tuple.hpp
+++ b/include/mbgl/util/indexed_tuple.hpp
@@ -31,16 +31,13 @@ public:
     using std::tuple<Ts...>::tuple;
 
     template <class I>
-    static constexpr std::size_t Index = TypeIndex<I, Is...>::value;
-
-    template <class I>
     auto& get() {
-        return std::get<Index<I>>(*this);
+        return std::get<TypeIndex<I, Is...>::value>(*this);
     }
 
     template <class I>
     const auto& get() const {
-        return std::get<Index<I>>(*this);
+        return std::get<TypeIndex<I, Is...>::value>(*this);
     }
 
     template <class... Js, class... Us>
diff --git a/include/mbgl/util/interpolate.hpp b/include/mbgl/util/interpolate.hpp
index a2103f18b2..6738987598 100644
--- a/include/mbgl/util/interpolate.hpp
+++ b/include/mbgl/util/interpolate.hpp
@@ -95,7 +95,11 @@ struct Interpolator<std::vector<T>>
     : Uninterpolated {};
 
 template <class T>
-constexpr bool Interpolatable = !std::is_base_of<Uninterpolated, Interpolator<T>>::value;
+struct Interpolatable
+    : std::conditional_t<
+      !std::is_base_of<Uninterpolated, Interpolator<T>>::value,
+      std::true_type,
+      std::false_type> {};
 
 } // namespace util
 } // namespace mbgl