Start work on span

1 files changed, 44 insertions, 0 deletions

diff --git a/asl/span.hpp b/asl/span.hpp
new file mode 100644
index 0000000..f3d4036
--- /dev/null
+++ b/asl/span.hpp
@@ -0,0 +1,44 @@
+#pragma once
+
+#include "asl/meta.hpp"
+#include "asl/annotations.hpp"
+#include "asl/layout.hpp"
+
+namespace asl
+{
+
+static constexpr int64_t dynamic_size = -1;
+
+template<is_object T, int64_t kSize = dynamic_size>
+class span
+{
+    static constexpr bool kIsDynamic = kSize < 0;
+
+    using SizeType = select_t<kIsDynamic, int64_t, empty>;
+
+    T* m_data{};
+    ASL_NO_UNIQUE_ADDRESS SizeType m_size{};
+
+public:
+    constexpr span() = default;
+
+    constexpr span(const span&) = default;
+    constexpr span(span&&) = default;
+    
+    constexpr span& operator=(const span&) = default;
+    constexpr span& operator=(span&&) = default;
+
+    ~span() = default;
+
+    constexpr int64_t size() const
+    {
+        if constexpr (kIsDynamic) { return m_size; }
+        else { return kSize; }
+    }
+
+    constexpr int64_t size_bytes() const { return size() * size_of<T>; }
+
+    constexpr bool is_empty() const { return size() == 0; }
+};
+
+} // namespace asl