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对于 Qt qmake变量,我有时会看到不同的符号。
例子
$$PWD $${PWD}
对我来说它似乎工作相同,有什么区别?
根据文档,这两个符号几乎是等价的。唯一的区别是the second notation allows you to append the contents of the variable to another value without separating the two with a space。
the second notation allows you to append the contents of the variable to another value without separating the two with a space