C++ typedef meaning

What does the following mean in C++?

ty开发者_StackOverflow社区pedef PComplex RComplex [100];

Note, PComplex is a user-defined type in my code.

Thanks

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RComplex is a synonym for PComplex[100]. Typedefs have a similar syntax to variable declarations, except in place of a variable name you get a typename.

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This aliases RComplex to the type "array (of length 100) of PComplex", also known as PComplex[100]. The following two variable declarations give each the same type: (after the above typedef)

PComplex a[100];
RComplex b;

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The declares a type synonym called PComplex which is actually an array of 100 RComplex items.