Thanks. Everything is explained perfectly. On Friday 27 October 2006 13:54, Eric Sunshine wrote: > On 10/26/06, Genjix <[EMAIL PROTECTED]> wrote: > > I'm not too clear how csArrayCmp can be used. > > csArrayCmp is a class which encapsulates both the key for which you > want to search and the function which knows how to compare that key > against an element in the array. When you want to search for a > particular element in an array, you pass an instance of csArrayCmp to > csArray<>::FindKey(), FindSortedKey(), etc. > > > Do I pass in a functor object as > > the second argument in the constructor... then what? > > The second argument to the csArrayCmp is a function which knows how to > compare the supplied key (first argument) against an array element. If > the compiler already knows how to compare your key against an array > element, then you don't need to supply the second argument. This is > true for many types, such as numbers, strings, simple structures, etc. > > Typically, the only time you need to supply the second argument is > when the compiler's default comparison mechanism is inappropriate or > when the key is only a subset of the element type stored in the array. > For instance, if you are searching the 'name' field in an array of > elements of type 'struct Person', you would supply a comparison > function which knows how to extract the 'name' from a 'Person' in > order to perform the comparison. > > > How does csArray know what the key value is inside an object? > > csArray itself never cares about the key stored inside the csArrayCmp > instance. Instead, it merely asks csArrayCmp if an element of the > array matches the supplied key. The key and the manner in which the > key is compared against an array element are encapsulated and hidden > from csArray. > > -- ES > > ------------------------------------------------------------------------- > Using Tomcat but need to do more? Need to support web services, security? > Get stuff done quickly with pre-integrated technology to make your job > easier Download IBM WebSphere Application Server v.1.0.1 based on Apache > Geronimo > http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 > _______________________________________________ > Crystal-main mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/crystal-main > Unsubscribe: > mailto:[EMAIL PROTECTED]
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