<QtDarwinHelpers>
基于达尔文的操作系统特有的辅助宏。更多
| Header: | #include <QtDarwinHelpers> |
宏
| Q_FORWARD_DECLARE_CF_TYPE(type) | |
| Q_FORWARD_DECLARE_MUTABLE_CF_TYPE(type) | |
| Q_FORWARD_DECLARE_OBJC_CLASS(classname) |
宏文档
Q_FORWARD_DECLARE_CF_TYPE(type)
Forward-声明一个核心基础type 。这包括实际类型和 ref 类型。例如，Q_FORWARD_DECLARE_CF_TYPE(CFString) 声明了 __CFString 和 CFStringRef。
Q_FORWARD_DECLARE_MUTABLE_CF_TYPE(type)
前向声明一个可变的核心基础type 。这包括实际类型和 ref 类型。例如，Q_FORWARD_DECLARE_MUTABLE_CF_TYPE(CFMutableString) 声明了 __CFMutableString 和 CFMutableStringRef。
Q_FORWARD_DECLARE_OBJC_CLASS(classname)
前向声明 Objective-Cclassname 的方式，使其可以编译为 Objective-C 或 C++。
这主要用于头文件，Objective-C 和 C++ 源文件都可能包含这些头文件。
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