c - bitwise OR in iOS - 


enum {    uiviewanimationoptionlayoutsubviews            = 1 <<  0,    uiviewanimationoptionallowuserinteraction      = 1 <<  1,    uiviewanimationoptionbeginfromcurrentstate     = 1 <<  2,    uiviewanimationoptionrepeat                    = 1 <<  3,    uiviewanimationoptionautoreverse               = 1 <<  4,    uiviewanimationoptionoverrideinheritedduration = 1 <<  5,    uiviewanimationoptionoverrideinheritedcurve    = 1 <<  6,    uiviewanimationoptionallowanimatedcontent      = 1 <<  7,    uiviewanimationoptionshowhidetransitionviews   = 1 <<  8,     uiviewanimationoptioncurveeaseinout            = 0 << 16,    uiviewanimationoptioncurveeasein               = 1 << 16,    uiviewanimationoptioncurveeaseout              = 2 << 16,    uiviewanimationoptioncurvelinear               = 3 << 16,     uiviewanimationoptiontransitionnone            = 0 << 20,    uiviewanimationoptiontransitionflipfromleft    = 1 << 20,    uiviewanimationoptiontransitionflipfromright   = 2 << 20,    uiviewanimationoptiontransitioncurlup          = 3 << 20,    uiviewanimationoptiontransitioncurldown        = 4 << 20, }; typedef nsuinteger uiviewanimationoptions;

what means expression: uiviewanimationoptionrepeat | uiviewanimationoptionautoreverse.

value of uiviewanimationoptionrepeat equal 8(in bin 1000), uiviewanimationoptionautoreverse equal 16(in bin 10000). expression uiviewanimationoptionrepeat | uiviewanimationoptionautoreverse should generate think 16(bin 10000) -> uiviewanimationoptionreverse.

uiviewanimationoptionrepeat | uiviewanimationoptionautoreverse known "mask".

if have variable of type uiviewanimationoptions, say:

 uiviewanimationoptions a;

you can apply mask this:

 bool b = && (uiviewanimationoptionrepeat | uiviewanimationoptionautoreverse)

to determine if a "contains" either flags. if

a == 0x0000001;

then

b == false;

if 

a == 0x0101001;  //-- arbitrary mask

then

 b == true;

so not interested in uiviewanimationoptionrepeat | uiviewanimationoptionautoreverse evaluates to, in result of logically and-ing value of type flags interested in checking.


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