This patch transfer Inset::destroyed signal to InsetText and InsetMathNest thus freeing some memory as normal math chars and symbols won't have it.

It also solve a crash with non disconnect boost::signal and gcc-3.3 or 3.4.


git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@18592 a592a061-630c-0410-9148-cb99ea01b6c8

src/CursorSlice.cpp

@@ -42,7 +42,9 @@ CursorSlice::CursorSlice(Inset & p)
 	: inset_(&p), idx_(0), pit_(0), pos_(0)
 {
 	BOOST_ASSERT(inset_);
-	inset_->destroyed.connect(
+	boost::signal<void()> * destroyed_signal = inset_->destroyedSignal();
+	if (destroyed_signal)
+		inset_connection_ = destroyed_signal->connect(
 			boost::bind(&CursorSlice::invalidate, this));
 }
 
@@ -53,15 +55,20 @@ CursorSlice::CursorSlice(CursorSlice const & cs)
 }
 
 
+CursorSlice::~CursorSlice()
+{
+	inset_connection_.disconnect();
+}
+
+
 CursorSlice & CursorSlice::operator=(CursorSlice const & cs)
 {
 	inset_ = cs.inset_;
 	idx_ = cs.idx_;
 	pit_ = cs.pit_;
 	pos_ = cs.pos_;
-	if (inset_) {
-		BOOST_ASSERT(inset_);
-		inset_->destroyed.connect(
+	if (inset_ && inset_->destroyedSignal()) {
+		inset_connection_ = inset_->destroyedSignal()->connect(
 			boost::bind(&CursorSlice::invalidate, this));
 	}
 	return *this;

src/CursorSlice.h

@@ -63,6 +63,8 @@ public:
 	///
 	explicit CursorSlice(Inset &);
 	///
+	virtual ~CursorSlice();
+	///
 	CursorSlice & operator=(CursorSlice const &);
 	///
 	bool isValid() const;
@@ -156,6 +158,8 @@ private:
 	bool pit_valid_;
 	/// position in this cell
 	pos_type pos_;
+	/// connection to referred \c inset_ destruction signal.
+	boost::signals::connection inset_connection_;
 };
 
 /// test for equality

src/insets/Inset.cpp

@@ -121,19 +121,6 @@ Inset::Inset()
 {}
 
 
-Inset::Inset(Inset const & inset)
-	: dim_(inset.dim_), background_color_(inset.background_color_)
-{}
-
-
-Inset & Inset::operator=(Inset const & inset)
-{
-	dim_ = inset.dim_;
-	background_color_ = inset.background_color_;
-	return *this;
-}
-
-
 std::auto_ptr<Inset> Inset::clone() const
 {
 	std::auto_ptr<Inset> b = doClone();

src/insets/Inset.h

@@ -56,7 +56,7 @@ namespace graphics { class PreviewLoader; }
 // everything storing large quantities of insets. Mathed e.g. would
 // suffer.
 
-class Inset : public boost::noncopyable {
+class Inset {
 public:
 	///
 	typedef ptrdiff_t  difference_type;
@@ -72,7 +72,7 @@ public:
 	typedef size_t     col_type;
 
 	/// virtual base class destructor
-	virtual ~Inset() { destroyed();}
+	virtual ~Inset() {}
 	/// replicate ourselves
 	std::auto_ptr<Inset> clone() const;
 
@@ -477,14 +477,15 @@ public:
 	//
 	enum { TEXT_TO_INSET_OFFSET = 4 };
 
-	/// This signal is emitted when the inset is destroyed.
-	boost::signal<void()> destroyed;
+	/// Signal for inset destruction.
+	/** This signal is emitted at the inset destruction for insets that
+	*   support this.
+	*/
+	virtual boost::signal<void()> * destroyedSignal() { return 0; }
 
 protected:
 	Inset();
-	Inset(Inset const & i);
-	///
-	Inset & operator=(Inset const &);
+
 	/** The real dispatcher.
 	 *  Gets normally called from Cursor::dispatch(). Cursor::dispatch()
 	 *  assumes the common case of 'LFUN handled, need update'.

src/insets/InsetText.cpp

@@ -51,6 +51,7 @@
 
 #include <boost/bind.hpp>
 #include <boost/current_function.hpp>
+#include <boost/signal.hpp>
 
 #include <sstream>
 

src/insets/InsetText.h

@@ -42,6 +42,8 @@ public:
 	explicit InsetText(BufferParams const &);
 	///
 	InsetText();
+	///
+	virtual ~InsetText() { destroyed(); }
 
 	/// empty inset to empty par
 	void clear();
@@ -138,6 +140,8 @@ public:
 	virtual bool wide() const { return wide_inset_; }
 	///
 	void setWide(bool wide_inset) { wide_inset_ = wide_inset; }
+	///
+	boost::signal<void()> * destroyedSignal() { return &destroyed; }
 
 protected:
 	///
@@ -159,6 +163,9 @@ private:
 	mutable pit_type old_pit;
 	///
 	bool wide_inset_;
+	/// This signal is emitted when the inset is destroyed.
+	boost::signal<void()> destroyed;
+
 public:
 	///
 	mutable Text text_;

src/mathed/InsetMathNest.cpp

@@ -78,6 +78,20 @@ InsetMathNest::InsetMathNest(idx_type nargs)
 {}
 
 
+InsetMathNest::InsetMathNest(InsetMathNest const & inset)
+	: InsetMath(inset), cells_(inset.cells_), lock_(inset.lock_)
+{}
+
+
+InsetMathNest & InsetMathNest::operator=(InsetMathNest const & inset)
+{
+	cells_ = inset.cells_;
+	lock_ = inset.lock_;
+	InsetMath::operator=(inset);
+	return *this;
+}
+
+
 InsetMath::idx_type InsetMathNest::nargs() const
 {
 	return cells_.size();

src/mathed/InsetMathNest.h

@@ -27,6 +27,8 @@ class InsetMathNest : public InsetMath {
 public:
 	/// nestinsets have a fixed size to start with
 	explicit InsetMathNest(idx_type ncells);
+	///
+	virtual ~InsetMathNest() { destroyed(); }
 
 	/// the size is usually some sort of convex hull of the cells
 	/// hides inset::metrics() intentionally!
@@ -104,7 +106,15 @@ public:
 	int latex(Buffer const &, odocstream & os,
 			OutputParams const & runparams) const;
 
+	/// This signal is emitted when the inset is destroyed.
+	boost::signal<void()> * destroyedSignal() { return &destroyed; }
+
 protected:
+	///
+	InsetMathNest(InsetMathNest const & inset);
+	///
+	InsetMathNest & operator=(InsetMathNest const &);
+
 	///
 	virtual void doDispatch(Cursor & cur, FuncRequest & cmd);
 	/// do we want to handle this event?
@@ -146,6 +156,10 @@ protected:
 	cells_type cells_;
 	/// if the inset is locked, it can't be entered with the cursor
 	bool lock_;
+
+private:
+	/// This signal is emitted when the inset is destroyed.
+	boost::signal<void()> destroyed;
 };