IOS---Block (intercepts automatic variable values)

Source: Internet
Author: User

First on the code:

int main(){    int256;    int10;    constchar"val = %d\n";    void (^blk)(void) = ^{print(fmt, val)};    2;    "These values were changed. val = %d\n";    blk();    return0;}

In this code, the block syntax expression uses the automatic variables that it declared before Fmt and Val. In blocks, the block expression intercepts the value of the automatic variable used, that is, the value of the automatic variable is saved, so after the block syntax is executed, even overwriting the value of the automatic variable used in the block does not affect the value of the automatic variable Blcok execution.

IOS---Block (intercepts automatic variable values)

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