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question about function object
Post 302497305 by homeboy on Wednesday 16th of February 2011 11:16:40 PM
02-17-2011
Quote:
Code:
template<class ForwIter,class Predicate>
ForwIter std::remove_if(ForwIter beg,ForeIter end,Predicate op)
{
//A copy of "op" is created inside find_if effectively
// as a local variable. This is how pass-by-value works, rather
// than pass-by-reference. changes made in find_if aren't reflected
// in our original "op".
ForwIter pos = find_if(beg,end,op);
if(pos == end)
return beg;
else{
ForwIter next = beg;
return remove_copy_if(++next,end,beg,op);
}
}Code:
template<class ForwIter,class Predicate>
ForwIter std::remove_if(ForwIter beg,ForeIter end,Predicate op)
{
// Here we use 'op' directly, not a copy of it.
while(beg != end && !op(*beg))
beg++;
if(pos == end)
return beg;
else{
ForwIter next = beg;
//Now that we've modified it in the manner we wanted,
// we pass the modified version into remove_copy_if.
return remove_copy_if(++next,end,beg,op);
}
}
.Thank you again!This User Gave Thanks to homeboy For This Post:
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XmScrollVisible(library call) XmScrollVisible(library call) NAME
XmScrollVisible -- A ScrolledWindow function that makes an invisible descendant of a ScrolledWindow work area visible SYNOPSIS
#include <Xm/ScrolledW.h> void XmScrollVisible( Widget scrollw_widget, Widget widget, Dimension left_right_margin, Dimension top_bottom_margin); DESCRIPTION
XmScrollVisible makes an obscured or partially obscured widget or gadget descendant of a ScrolledWindow work area visible. The function re- positions the work area and sets the specified margins between the widget and the nearest viewport boundary. The widget's location relative to the viewport determines whether one or both of the margins must be adjusted. This function requires that the XmNscrollingPolicy of the ScrolledWindow widget be set to XmAUTOMATIC. scrollw_widget Specifies the ID of the ScrolledWindow widget whose work area window contains an obscured descendant. widget Specifies the ID of the widget to be made visible. left_right_margin Specifies the margin to establish between the left or right edge of the widget and the associated edge of the viewport. This margin is established only if the widget must be moved horizontally to make it visible. top_bottom_margin Specifies the margin to establish between the top or bottom edge of the widget and the associated edge of the viewport. This margin is established only if the widget must be moved vertically to make it visible. For a complete definition of ScrolledWindow and its associated resources, see XmScrolledWindow(3) RELATED
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