More cleanup on the back of Osso's fix for a7e393b36b (nw)

* Make iterators actually meet requirements of ForwardIterator (and by consequence, ForwardIterator, Iterator and EqualityComparable)
* Don't use function statics if they can be avoided - it isn't thread-safe
* Remove leftover crud from when dynamic_buffer and friends were templates in lib/util

It's still dangerous that the const behaviour of iterators doesn't match STL.
Also, simple_list members with similar functionality to STL container members should be renamed.

src/emu/device.h

@@ -111,7 +111,7 @@ class device_t : public delegate_late_bind
 		friend class device_t;
 		friend class machine_config;
 
-public:
+	public:
 		// construction/destruction
 		subdevice_list() { }
 
@@ -125,7 +125,7 @@ public:
 		auto_iterator begin() const { return m_list.begin(); }
 		auto_iterator end() const { return m_list.end(); }
 
-private:
+	private:
 		// private helpers
 		device_t *find(const std::string &name) const
 		{
@@ -149,19 +149,28 @@ private:
 		friend class device_state_interface;
 		friend class device_execute_interface;
 
-public:
+	public:
 		class auto_iterator
 		{
-public:
+		public:
+			typedef std::ptrdiff_t difference_type;
+			typedef device_interface value_type;
+			typedef device_interface *pointer;
+			typedef device_interface &reference;
+			typedef std::forward_iterator_tag iterator_category;
+
 			// construction/destruction
 			auto_iterator(device_interface *intf) : m_current(intf) { }
 
-			// required operator overrides
+			// required operator overloads
+			bool operator==(const auto_iterator &iter) const { return m_current == iter.m_current; }
 			bool operator!=(const auto_iterator &iter) const { return m_current != iter.m_current; }
 			device_interface &operator*() const { return *m_current; }
-			const auto_iterator &operator++();
+			device_interface *operator->() const { return m_current; }
+			auto_iterator &operator++();
+			auto_iterator operator++(int);
 
-private:
+		private:
 			// private state
 			device_interface *m_current;
 		};
@@ -176,8 +185,8 @@ private:
 		auto_iterator begin() const { return auto_iterator(m_head); }
 		auto_iterator end() const { return auto_iterator(nullptr); }
 
-private:
-		device_interface *      m_head;         // head of interface list
+	private:
+		device_interface *m_head;               // head of interface list
 		device_execute_interface *m_execute;    // pre-cached pointer to execute interface
 		device_memory_interface *m_memory;      // pre-cached pointer to memory interface
 		device_state_interface *m_state;        // pre-cached pointer to state interface
@@ -768,12 +777,19 @@ inline device_t *device_t::siblingdevice(const char *tag) const
 }
 
 
-// this operator requires device_interface to be a complete type
-inline const device_t::interface_list::auto_iterator &device_t::interface_list::auto_iterator::operator++()
+// these operators requires device_interface to be a complete type
+inline device_t::interface_list::auto_iterator &device_t::interface_list::auto_iterator::operator++()
 {
 	m_current = m_current->interface_next();
 	return *this;
 }
 
+inline device_t::interface_list::auto_iterator device_t::interface_list::auto_iterator::operator++(int)
+{
+	auto_iterator result(*this);
+	m_current = m_current->interface_next();
+	return result;
+}
+
 
 #endif  /* __DEVICE_H__ */

src/emu/emumem.cpp

@@ -4038,7 +4038,7 @@ memory_block::memory_block(address_space &space, offs_t bytestart, offs_t byteen
 		m_byteend(byteend),
 		m_data(reinterpret_cast<UINT8 *>(memory))
 {
-	offs_t length = byteend + 1 - bytestart;
+	offs_t const length = byteend + 1 - bytestart;
 	VPRINTF(("block_allocate('%s',%s,%08X,%08X,%p)\n", space.device().tag(), space.name(), bytestart, byteend, memory));
 
 	// allocate a block if needed

src/emu/render.h

@@ -1041,6 +1041,8 @@ private:
 	simple_list<item>   m_bezel_list;       // list of bezel items
 	simple_list<item>   m_cpanel_list;      // list of marquee items
 	simple_list<item>   m_marquee_list;     // list of marquee items
+
+	static const simple_list<item> s_null_list;
 };
 
 

src/emu/rendlay.cpp

@@ -2208,6 +2208,8 @@ void layout_element::component::apply_skew(bitmap_argb32 &dest, int skewwidth)
 //  LAYOUT VIEW
 //**************************************************************************
 
+const simple_list<layout_view::item> layout_view::s_null_list;
+
 //-------------------------------------------------
 //  layout_view - constructor
 //-------------------------------------------------
@@ -2270,8 +2272,6 @@ layout_view::~layout_view()
 
 const simple_list<layout_view::item> &layout_view::items(item_layer layer) const
 {
-	static simple_list<item> s_null_list;
-
 	switch (layer)
 	{
 		case ITEM_LAYER_BACKDROP:   return m_backdrop_list;

src/lib/util/coretmpl.h

@@ -16,14 +16,10 @@
 #include "osdcore.h"
 #include "corealloc.h"
 
+#include <iterator>
+#include <utility>
 #include <vector>
 
-// TEMPORARY helper to catch is_pod assertions in the debugger
-#if 0
-#undef assert
-#define assert(x) do { if (!(x)) { fprintf(stderr, "Assert: %s\n", #x); osd_break_into_debugger("Assertion failed"); } } while (0)
-#endif
-
 
 typedef std::vector<UINT8> dynamic_buffer;
 
@@ -38,32 +34,53 @@ class simple_list final
 public:
 	class auto_iterator
 	{
-public:
+	public:
+		typedef int difference_type;
+		typedef _ElementType value_type;
+		typedef _ElementType *pointer;
+		typedef _ElementType &reference;
+		typedef std::forward_iterator_tag iterator_category;
+
 		// construction/destruction
+		auto_iterator() noexcept : m_current(nullptr) { }
 		auto_iterator(_ElementType *ptr) noexcept : m_current(ptr) { }
 
-		// required operator overrides
+		// required operator overloads
+		bool operator==(const auto_iterator &iter) const noexcept { return m_current == iter.m_current; }
 		bool operator!=(const auto_iterator &iter) const noexcept { return m_current != iter.m_current; }
 		_ElementType &operator*() const noexcept { return *m_current; }
+		_ElementType *operator->() const noexcept { return m_current; }
 		// note that _ElementType::next() must not return a const ptr
-		const auto_iterator &operator++() noexcept { m_current = m_current->next(); return *this; }
+		auto_iterator &operator++() noexcept { m_current = m_current->next(); return *this; }
+		auto_iterator operator++(int) noexcept { auto_iterator result(*this); m_current = m_current->next(); return result; }
 
-private:
+	private:
 		// private state
 		_ElementType *m_current;
 	};
 
+	// construction/destruction
+	simple_list() noexcept
+		: m_head(nullptr)
+		, m_tail(nullptr)
+		, m_count(0)
+	{
+	}
+	~simple_list() noexcept { reset(); }
+
 	// we don't support deep copying
 	simple_list(const simple_list &) = delete;
 	simple_list &operator=(const simple_list &) = delete;
 
-	// construction/destruction
-	simple_list() noexcept
-		: m_head(nullptr),
-			m_tail(nullptr),
-			m_count(0) { }
-
-	~simple_list() noexcept { reset(); }
+	// but we do support cheap swap/move
+	simple_list(simple_list &&list) : simple_list() { operator=(std::move(list)); }
+	simple_list &operator=(simple_list &&list)
+	{
+		using std::swap;
+		swap(m_head, list.m_head);
+		swap(m_tail, list.m_tail);
+		swap(m_count, list.m_count);
+	}
 
 	// simple getters
 	_ElementType *first() const noexcept { return m_head; }