feat(ecs): introduce component view

Closes: #1
2026-09-07 23:05:39 +02:00
parent 320eb29957
commit 6639127bcf
4 changed files with 285 additions and 2 deletions
@@ -1,6 +1,7 @@
 #ifndef LIBCATBOY_ECS_SPARSE_SET_HPP
 #define LIBCATBOY_ECS_SPARSE_SET_HPP

+#include <span>
 #include <type_traits>
 #include <utility>
 #include <vector>
@@ -18,8 +19,11 @@ public:
    isparse_set(const isparse_set&)                = default;
    isparse_set& operator=(const isparse_set&)     = default;
 public:
-    virtual bool contains(std::size_t key) const noexcept = 0;
-    virtual void erase(std::size_t key) noexcept          = 0;
+    virtual bool                   contains(std::size_t key) const noexcept = 0;
+    virtual void                   erase(std::size_t key) noexcept          = 0;
+    virtual std::size_t            size() const noexcept                    = 0;
+    virtual std::size_t            sparse_size() const noexcept             = 0;
+    virtual std::span<std::size_t> dense_map() noexcept               = 0;
 };

 template <typename T>
@@ -70,6 +74,14 @@ public:
        m_reverseMap.pop_back();
        set_index(key, TOMBSTONE);
    }
+public:
+    std::size_t size() const noexcept override { return m_dense.size(); }
+
+    std::size_t sparse_size() const noexcept override { return m_map.size(); }
+
+    std::span<std::size_t> dense_map() noexcept override {
+        return m_reverseMap;
+    }
 private:
    void set_index(std::size_t key, std::size_t dense) {
        if (key >= m_map.size()) m_map.resize(key + 1, TOMBSTONE);