Sync a few templates with upstream Godot

include/godot_cpp/core/defs.hpp

@@ -176,23 +176,23 @@ namespace godot {
 #undef CLAMP
 
 template <typename T>
-constexpr const T SIGN(const T m_v) {
-	return m_v > 0 ? +1.0f : (m_v < 0 ? -1.0f : 0.0f);
+constexpr const T SIGN(const T p_value) {
+	return p_value > 0 ? +1.0f : (p_value < 0 ? -1.0f : 0.0f);
 }
 
 template <typename T, typename T2>
-constexpr auto MIN(const T m_a, const T2 m_b) {
-	return m_a < m_b ? m_a : m_b;
+constexpr auto MIN(const T p_left, const T2 p_right) {
+	return p_left < p_right ? p_left : p_right;
 }
 
 template <typename T, typename T2>
-constexpr auto MAX(const T m_a, const T2 m_b) {
-	return m_a > m_b ? m_a : m_b;
+constexpr auto MAX(const T p_left, const T2 p_right) {
+	return p_left > p_right ? p_left : p_right;
 }
 
 template <typename T, typename T2, typename T3>
-constexpr auto CLAMP(const T m_a, const T2 m_min, const T3 m_max) {
-	return m_a < m_min ? m_min : (m_a > m_max ? m_max : m_a);
+constexpr auto CLAMP(const T p_value, const T2 p_min, const T3 p_max) {
+	return p_value < p_min ? p_min : (p_value > p_max ? p_max : p_value);
 }
 
 // Like std::size, but without requiring any additional includes.
@@ -308,6 +308,13 @@ struct is_zero_constructible<const volatile T> : is_zero_constructible<T> {};
 template <typename T>
 inline constexpr bool is_zero_constructible_v = is_zero_constructible<T>::value;
 
+#if GD_HAS_CPP_ATTRIBUTE(gnu::warn_unused)
+// https://gcc.gnu.org/onlinedocs/gcc/C_002b_002b-Attributes.html#index-warn_005funused
+#define _WARN_UNUSED_ [[gnu::warn_unused]]
+#else
+#define _WARN_UNUSED_
+#endif
+
 // Warning suppression helper macros.
 #if defined(__clang__)
 #define GODOT_CLANG_PRAGMA(m_content) _Pragma(#m_content)

include/godot_cpp/templates/hash_map.hpp

@@ -30,11 +30,11 @@
 
 #pragma once
 
-#include <godot_cpp/templates/sort_list.h>
 #include <godot_cpp/core/error_macros.hpp>
 #include <godot_cpp/core/memory.hpp>
 #include <godot_cpp/templates/hashfuncs.hpp>
 #include <godot_cpp/templates/pair.hpp>
+#include <godot_cpp/templates/sort_list.hpp>
 
 #include <initializer_list>