cpp-common/bt2c/fmt.hpp: use `wise_enum::string_type` in `EnableIfIsWiseEnum` definition

wise_enum uses `const char *` as the string type for C++11/14 and
`std::string_view` for C++ >= 17.  Change `EnableIfIsWiseEnum` to use
`wise_enum::string_type` instead of a hard-coded `const char *`, to make
compilation in C++17 possible.

Change-Id: Ie179e1f5585128950ecdc095f7b136d93ea39e41
Signed-off-by: Simon Marchi <simon.marchi@efficios.com>
Reviewed-on: https://review.lttng.org/c/babeltrace/+/12497
Tested-by: jenkins <jenkins@lttng.org>
Reviewed-by: Philippe Proulx <eeppeliteloop@gmail.com>

diff --git a/src/cpp-common/bt2c/fmt.hpp b/src/cpp-common/bt2c/fmt.hpp
index a78d7a61af83f37bb7f5b4c96c0035b568401908..ab3d6bc875de3514ac5fa2fb4b8e2548f38cece4 100644 (file)
--- a/src/cpp-common/bt2c/fmt.hpp
+++ b/src/cpp-common/bt2c/fmt.hpp
@@ -13,7 +13,7 @@ namespace internal {
 
 template <typename T>
 using EnableIfIsWiseEnum =
-    typename std::enable_if<wise_enum::is_wise_enum<T>::value, const char *>::type;
+    typename std::enable_if<wise_enum::is_wise_enum<T>::value, wise_enum::string_type>::type;
 
 } /* namespace internal */