forward declaration

基本解释

A forward declaration for the type is not sufficient.
类型的前向声明不行。
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Can anyone give example of forward declaration in objective C for a normal class and not for category or protocol?
谁能给一个正常的类而不是类或协议的目标C的前向声明的例子吗？
Any attributes on a forward declaration should be less than the attributes on the definition or, at most, equal to them.
前向声明上的任何特性都应小于定义上的特性，或至多等于这些特性。

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