perf: cata::void_t to std::void_t (cataclysmbnteam#2524)

src/generic_factory.h

@@ -10,7 +10,6 @@
 
 #include "assign.h"
 #include "catacharset.h"
-#include "cata_void.h"
 #include "debug.h"
 #include "enum_bitset.h"
 #include "generic_readers.h"
@@ -646,11 +645,11 @@ inline void mandatory( const JsonObject &jo, const bool was_loaded, const std::s
  * Similarly, if it can use a += operator against it's own type, the non-dummy
  * handle_relative template is constructed.
  */
-template<typename T, typename = cata::void_t<>>
+template<typename T, typename = std::void_t<>>
 struct supports_proportional : std::false_type { };
 
 template<typename T>
-struct supports_proportional<T, cata::void_t<decltype( std::declval<T &>() *= std::declval<float>() )>> :
+struct supports_proportional<T, std::void_t<decltype( std::declval<T &>() *= std::declval<float>() )>> :
 std::true_type {};
 
 // Explicitly specialize these templates for a couple types

src/generic_readers.h

@@ -4,7 +4,6 @@
 
 #include <map>
 #include <vector>
-#include "cata_void.h"
 #include "json.h"
 #include "units.h"
 
@@ -18,11 +17,11 @@
  * Similarly, if it can use a += operator against it's own type, the non-dummy
  * handle_relative template is constructed.
  */
-template<typename T, typename = cata::void_t<>>
+template<typename T, typename = std::void_t<>>
 struct supports_relative : std::false_type { };
 
 template<typename T>
-struct supports_relative < T, cata::void_t < decltype( std::declval<T &>() += std::declval<T &>() )
+struct supports_relative < T, std::void_t < decltype( std::declval<T &>() += std::declval<T &>() )
 >> : std::true_type {};
 
 // Explicitly specialize these templates for a couple types

src/mod_tracker.h

@@ -4,7 +4,6 @@
 
 #include <string>
 
-#include "cata_void.h"
 #include "type_id.h"
 
 /**
@@ -23,11 +22,11 @@
  */
 
 /** Template magic to determine if the conditions above are satisfied */
-template<typename T, typename = cata::void_t<>>
+template<typename T, typename = std::void_t<>>
 struct has_src_member : std::false_type {};
 
 template<typename T>
-struct has_src_member<T, cata::void_t<decltype( std::declval<T &>().src.emplace_back( std::declval<T &>().id, mod_id() ) )>> :
+struct has_src_member<T, std::void_t<decltype( std::declval<T &>().src.emplace_back( std::declval<T &>().id, mod_id() ) )>> :
 std::true_type {};
 
 /** Dummy function, for if those conditions are not satisfied */