add hash() member function to global_coords

Author: sthalik

src/global-coords.cpp

@@ -1,5 +1,6 @@
 #include "global-coords.hpp"
 #include "point.inl"
+#include "compat/hash.hpp"
 #include <array>
 #include <algorithm>
 
@@ -32,6 +33,12 @@ Debug& operator<<(Debug& dbg, const chunk_coords_& c)
     return dbg;
 }
 
+size_t global_coords::hash() const noexcept
+{
+    static_assert(sizeof *this == 4 + 4);
+    return hash_buf(this, sizeof *this);
+}
+
 namespace {
 
 static_assert(sizeof(decltype(local_coords::x))*8 == 8);

src/global-coords.hpp

@@ -138,6 +138,8 @@ struct global_coords final
     constexpr global_coords& operator+=(Vector2i vec) noexcept;
     constexpr global_coords& operator-=(Vector2i vec) noexcept;
     constexpr Vector2i operator-(global_coords other) const noexcept;
+
+    size_t hash() const noexcept;
 };
 
 constexpr local_coords global_coords::local() const noexcept

test/hash.cpp

@@ -44,7 +44,7 @@ template<int16_t CoordMax, int8_t ZMax, uint32_t MaxCollisions>
             for (int8_t k = 0; k <= ZMax; k++)
             {
                 auto p = global_coords{i, j, k};
-                auto h = hash_buf(&p, sizeof p);
+                auto h = p.hash();
                 h %= BucketCount;
                 auto ref = bitset[h];
                 if (ref) [[unlikely]]