mirror of https://github.com/fltk/fltk
Add range check to Fl_Group::child(int)
Returns NULL if n is out of range to prevent accessing undefined memory.
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@ -29,7 +29,7 @@ class Fl_Rect;
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/**
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The Fl_Group class is the FLTK container widget. It maintains
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The Fl_Group class is the main FLTK container widget. It maintains
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an array of child widgets. These children can themselves be any widget
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including Fl_Group. The most important subclass of Fl_Group
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is Fl_Window, however groups can also be used to control radio buttons
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@ -95,11 +95,23 @@ public:
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/**
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Returns how many child widgets the group has.
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*/
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int children() const {return children_;}
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int children() const { return children_; }
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/**
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Returns array()[n]. <i>No range checking is done!</i>
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Returns the n'th child.
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Returns \c NULL if \c n is out of range (since FLTK 1.4.0).
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<i>No range checking was done in FLTK 1.3 and older versions!</i>
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\param[in] n index of child (0 .. children() - 1)
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\return pointer to the n'th child or NULL if out of range
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*/
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Fl_Widget* child(int n) const {return array()[n];}
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Fl_Widget *child(int n) const {
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if (n < 0 || n > children() - 1) return NULL;
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return array()[n];
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}
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int find(const Fl_Widget*) const;
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/**
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See int Fl_Group::find(const Fl_Widget *w) const
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