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C++ Code

if (MessageDlg(prompt, mtConfirmation, TMsgDlgButtons() << mbYes << mbNo, 0) == mrYes)

What does the code in bold mean? This is Borland C++, though it shouldn't matter. I am trying to figure if TMsgDlgButtons() is accepting parameters?? or is the << operator used as left shit bit operator?? Or anything else. Pls assume very little C++ experience.
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evilrix
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This is what the official help document says:

TMsgDlgButtons defines a set of values used by MessageDlg and MessageDlgPos.

Unit

Dialogs

enum TMsgDlgBtn { mbYes, mbNo, mbOK, mbCancel, mbAbort, mbRetry, mbIgnore, mbAll, mbNoToAll, mbYesToAll, mbHelp };
Can someone help me link the Help page with the actual usage in C++ terms?
State what is it you specifically don't understand and I'll try to make it clearer for you.