fix void_t for older compilers

1ea8cd12 · Théo DELRIEU · eb30ff06 · 1ea8cd12 · 1ea8cd12
Unverified Commit 1ea8cd12 authored Sep 07, 2018 by Théo DELRIEU
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Showing with 10 additions and 4 deletions

include/nlohmann/detail/meta/void_t.hpp include/nlohmann/detail/meta/void_t.hpp +5 -2

single_include/nlohmann/json.hpp single_include/nlohmann/json.hpp +5 -2

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--- a/include/nlohmann/detail/meta/void_t.hpp
+++ b/include/nlohmann/detail/meta/void_t.hpp
@@ -4,7 +4,10 @@ namespace nlohmann
 {
 namespace detail
 {
-template <typename...>
-using void_t = void;
+template <typename ...Ts> struct make_void
+{
+    using type = void;
+};
+template <typename ...Ts> using void_t = typename make_void<Ts...>::type;
 }
 }
--- a/single_include/nlohmann/json.hpp
+++ b/single_include/nlohmann/json.hpp
@@ -3572,8 +3572,11 @@ namespace nlohmann
 {
 namespace detail
 {
-template <typename...>
-using void_t = void;
+template <typename ...Ts> struct make_void
+{
+    using type = void;
+};
+template <typename ...Ts> using void_t = typename make_void<Ts...>::type;
 }
 }