Use C++17 variable templates for type traits

[stockfish] / src / tune.h

diff --git a/src/tune.h b/src/tune.h
index bdbee14e014956135cccbd37c3734141e0779980..dde03b324eac0449e4f124df236546ac6a7c8a27 100644 (file)
--- a/src/tune.h
+++ b/src/tune.h
@@ -19,12 +19,15 @@
 #ifndef TUNE_H_INCLUDED
 #define TUNE_H_INCLUDED
 
+#include <cstddef>
 #include <memory>
 #include <string>
-#include <type_traits>
+#include <type_traits> // IWYU pragma: keep
+#include <utility>
 #include <vector>
 
 namespace Stockfish {
+enum Value : int;
 
 using Range = std::pair<int, int>; // Option's min-max values
 using RangeFun = Range (int);
@@ -93,11 +96,11 @@ class Tune {
   template<typename T>
   struct Entry : public EntryBase {
 
-    static_assert(!std::is_const<T>::value, "Parameter cannot be const!");
+    static_assert(!std::is_const_v<T>, "Parameter cannot be const!");
 
-    static_assert(   std::is_same<T,   int>::value
-                  || std::is_same<T, Value>::value
-                  || std::is_same<T, PostUpdate>::value, "Parameter type not supported!");
+    static_assert(   std::is_same_v<T, int>
+                  || std::is_same_v<T, Value>
+                  || std::is_same_v<T, PostUpdate>, "Parameter type not supported!");
 
     Entry(const std::string& n, T& v, const SetRange& r) : name(n), value(v), range(r) {}
     void operator=(const Entry&) = delete; // Because 'value' is a reference