Fix handling of types with deleted rvalue conversion to string (#1421)

2019-11-25 08:30:47 -08:00
parent 57cd3f72e9
commit 99b6e928d4
2 changed files with 12 additions and 1 deletions
--- a/include/fmt/core.h
+++ b/include/fmt/core.h
@@ -923,7 +923,7 @@ template <typename Context> struct arg_mapper {
 // A type constant after applying arg_mapper<Context>.
 template <typename T, typename Context>
 using mapped_type_constant =
-    type_constant<decltype(arg_mapper<Context>().map(std::declval<T>())),
+    type_constant<decltype(arg_mapper<Context>().map(std::declval<const T&>())),
                  typename Context::char_type>;

 enum { packed_arg_bits = 5 };