Work around GNU libstdc++ wanting to stack large temporaries when vector elements can be trivially constructed.

docs/source/techspecs/memory.rst

@@ -264,10 +264,10 @@ before.  It is created as an object of the device.
 
     [device constructor] m_view(*this, "name"),
 
-It is then setup through the address map API or dynamically.  The, at
+It is then setup through the address map API or dynamically.  At
-runtime, a variant, which is numbered, can be selected through the
+runtime, a numbered variant can be selected using the ``select`` method,
-``select`` method or the view can be disabled through the ``disabled``
+or the view can be disabled using the ``disable`` method.  A disabled
-method.  A disabled view can be reenabled at any time.
+view can be re-enabled at any time.
 
 
 4. Address maps API
@@ -617,9 +617,9 @@ second method to setup a view is perfectly reasonable.  A view is of
 type **memory_view** and an indexed entry (e.g. a variant to setup) is
 of type **memory_view::memory_view_entry &**.
 
-A view can be installed in another view, but don't forget that a view
+A view can be installed in another view, but don’t forget that a view
-can be installed only once.  A view can also being part of "what was
+can be installed only once.  A view can also be part of “what was there
-there before".
+before”.
 
 
 5. Address space dynamic mapping API

src/emu/emumem_hedr.h

@@ -54,10 +54,30 @@ private:
 	static constexpr offs_t HIGHMASK = make_bitmask<offs_t>(HighBits) ^ LOWMASK;
 	static constexpr offs_t UPMASK   = ~make_bitmask<offs_t>(HighBits);
 
+	class handler_array : public std::array<handler_entry_read<Width, AddrShift, Endian> *, COUNT>
+	{
+	public:
+		using std::array<handler_entry_read<Width, AddrShift, Endian> *, COUNT>::array;
+		handler_array()
+		{
+			std::fill(this->begin(), this->end(), nullptr);
+		}
+	};
+
+	class range_array : public std::array<handler_entry::range, COUNT>
+	{
+	public:
+		using std::array<handler_entry::range, COUNT>::array;
+		range_array()
+		{
+			std::fill(this->begin(), this->end(), handler_entry::range{ 0, 0 });
+		}
+	};
+
 	memory_view *m_view;
 
-	std::vector<std::array<handler_entry_read<Width, AddrShift, Endian> *, COUNT>> m_dispatch_array;
+	std::vector<handler_array> m_dispatch_array;
-	std::vector<std::array<handler_entry::range, COUNT>> m_ranges_array;
+	std::vector<range_array> m_ranges_array;
 
 	handler_entry_read<Width, AddrShift, Endian> **m_a_dispatch;
 	handler_entry::range *m_a_ranges;

src/emu/emumem_hedr.ipp

@@ -600,7 +600,7 @@ template<int HighBits, int Width, int AddrShift, endianness_t Endian> void handl
 	if(i > m_dispatch_array.size())
 		fatalerror("out-of-range view update selection.");
 	else if(i == m_dispatch_array.size()) {
-		u32 aid = (std::array<handler_entry_read<Width, AddrShift, Endian> *, COUNT> *)(m_a_dispatch) - m_dispatch_array.data();
+		u32 aid = (handler_array *)(m_a_dispatch) - m_dispatch_array.data();
 
 		m_dispatch_array.resize(i+1);
 		m_ranges_array.resize(i+1);

src/emu/emumem_hedw.h

@@ -54,10 +54,30 @@ private:
 	static constexpr offs_t HIGHMASK = make_bitmask<offs_t>(HighBits) ^ LOWMASK;
 	static constexpr offs_t UPMASK   = ~make_bitmask<offs_t>(HighBits);
 
+	class handler_array : public std::array<handler_entry_write<Width, AddrShift, Endian> *, COUNT>
+	{
+	public:
+		using std::array<handler_entry_write<Width, AddrShift, Endian> *, COUNT>::array;
+		handler_array()
+		{
+			std::fill(this->begin(), this->end(), nullptr);
+		}
+	};
+
+	class range_array : public std::array<handler_entry::range, COUNT>
+	{
+	public:
+		using std::array<handler_entry::range, COUNT>::array;
+		range_array()
+		{
+			std::fill(this->begin(), this->end(), handler_entry::range{ 0, 0 });
+		}
+	};
+
 	memory_view *m_view;
 
-	std::vector<std::array<handler_entry_write<Width, AddrShift, Endian> *, COUNT>> m_dispatch_array;
+	std::vector<handler_array> m_dispatch_array;
-	std::vector<std::array<handler_entry::range, COUNT>> m_ranges_array;
+	std::vector<range_array> m_ranges_array;
 
 	handler_entry_write<Width, AddrShift, Endian> **m_a_dispatch;
 	handler_entry::range *m_a_ranges;

src/emu/emumem_hedw.ipp

@@ -606,7 +606,7 @@ template<int HighBits, int Width, int AddrShift, endianness_t Endian> void handl
 	if(i > m_dispatch_array.size())
 		fatalerror("out-of-range view update selection.");
 	else if(i == m_dispatch_array.size()) {
-		u32 aid = (std::array<handler_entry_write<Width, AddrShift, Endian> *, COUNT> *)(m_a_dispatch) - m_dispatch_array.data();
+		u32 aid = (handler_array *)(m_a_dispatch) - m_dispatch_array.data();
 
 		m_dispatch_array.resize(i+1);
 		m_ranges_array.resize(i+1);