Gcc/10.2.0/gcc/c99 002dlike-fast-enumeration-syntax
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8.9.2 C99-Like Fast Enumeration Syntax
A c99-like declaration syntax is also allowed:
id array = …; for (id object in array) { /* Do something with 'object' */ }
this is completely equivalent to:
id array = …; { id object; for (object in array) { /* Do something with 'object' */ } }
but can save some typing.
Note that the option -std=c99
is not required to allow this
syntax in Objective-C.