luna: Add StaticString, an OOP char[]

luna/include/luna/StaticString.h

@@ -0,0 +1,52 @@
+#pragma once
+#include <luna/CString.h>
+#include <luna/Types.h>
+
+template <usize Size> class StaticString
+{
+  public:
+    StaticString() = default;
+    StaticString(const char* string)
+    {
+        adopt(string);
+    }
+
+    void adopt(const char* string)
+    {
+        usize length = strlcpy(m_buffer, string, sizeof(m_buffer));
+        if (length > Size) { m_length = Size; }
+        else
+            m_length = length;
+    }
+
+    StaticString<Size>& operator=(const char* string)
+    {
+        adopt(string);
+        return *this;
+    }
+
+    template <usize OSize> StaticString<Size>& operator=(const StaticString<OSize>& string)
+    {
+        if constexpr (OSize == Size)
+        {
+            if (this == &string) return *this;
+        }
+
+        adopt(string.chars());
+        return *this;
+    }
+
+    const char* chars() const
+    {
+        return m_buffer;
+    }
+
+    usize length() const
+    {
+        return m_length;
+    }
+
+  private:
+    char m_buffer[Size + 1];
+    usize m_length { 0 };
+};