objective c - #define ... method call. Why? -

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i have come across of sort of thing in codebase need across: 

#define timestamp [nsstring stringwithformat:@"%d",(int)([[nsdate date] timeintervalsince1970]) ]

why this, opposed creating method in implementation? seems such odd thing do, there must benefit it.

i have seen done in c lot, make code inline rather in separate function

it removes overhead of calling function, when function line long.it forces inline

pretty compiler make small function in-line anyway there isn't reason this. more of stylistic choice. error-prone


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