1 files changed, 36 insertions, 0 deletions
diff --git a/zen/legacy_compiler.h b/zen/legacy_compiler.h
index 16d87c53..bebf5a05 100755
--- a/zen/legacy_compiler.h
+++ b/zen/legacy_compiler.h
@@ -7,11 +7,47 @@
 #ifndef LEGACY_COMPILER_H_839567308565656789
 #define LEGACY_COMPILER_H_839567308565656789
 
+//#include <span> //requires C++20
+
+
 namespace std
 {
 //https://gcc.gnu.org/onlinedocs/libstdc++/manual/status.html
 //https://isocpp.org/std/standing-documents/sd-6-sg10-feature-test-recommendations
 
+
+
+//requires C++20! until then, this should suffice...
+template <class T>
+class span
+{
+public:
+    template <class Iterator>
+    span(Iterator first, Iterator last) : size_(last - first), data_(first != last ? &*first : nullptr) {}
+
+    template <class Container>
+    span(Container& cont) : span(cont.begin(), cont.end()) {}
+    
+    using iterator        = T*;
+    using const_iterator  = const T*;
+       
+    iterator begin() { return data_; }
+    iterator end  () { return data_ + size_; }
+
+    const_iterator begin() const { return data_; }
+    const_iterator end  () const { return data_ + size_; }
+
+    const_iterator cbegin() const { return begin(); }
+    const_iterator cend  () const { return end  (); }
+
+    T*     data() const { return data_; }
+    size_t size() const { return size_; }
+    bool  empty() const { return size_ == 0; }
+
+private:
+    const size_t size_;
+    T* const data_;
+};
 }
 
 #endif //LEGACY_COMPILER_H_839567308565656789