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delphidelphi-2010delphi-xertti

How to grab TRTTIParamter's default value

I have this class:

TMyClass = class
public
  function DoSomethingNice(const Value: string = 'Yes please!'): Boolean;
end;

Now, using RTTI, is it possible to get default value of parameter Value of method DoSomethingNice? if so, how?

I'm mostly interested in a D2010 solution, but XE will do also.

Solution

  • it is impossible, because RTTI has not information about default parameters. default parameter values are used only at compile time

    so, if we have... procedure test(x : integer = 3) and then call method without parameter value: test() then it will be compiled as test(3)

    to check this you can open CPU window in debugger: and test() looks like

     mov  eax, $00000003
 call test