forward declaration

基本解释

A forward declaration for the type is not sufficient.
類型的前曏聲明不行。
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Can anyone give example of forward declaration in objective C for a normal class and not for category or protocol?
誰能給一個正常的類而不是類或協議的目標C的前曏聲明的例子嗎？
Any attributes on a forward declaration should be less than the attributes on the definition or, at most, equal to them.
前曏聲明上的任何特性都應小於定義上的特性，或至多等於這些特性。

It will also allow us to move forward on the Strategic Partnership declaration and will allow us to move forward on the overall strategy in place, which includes a drawing down of U.S. forces as we transition to Afghan security lead.
WHITEHOUSE: Press Briefing
The forum is an opportunity to identify practical applications of the Declaration and actions going forward.
UNESCO: CULTURE
So that was more or less a declaration he intends to go forward with his program.
CENTERFORSECURITYPOLICY: Center for Security Policy