What is the diffrence between this :
struct foo
{
......
};
and
typedef struct foo
{
......
};
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In this case, beyond the duplicate [**here**](http://stackoverflow.com/questions/1675351/typedef-struct-vs-struct-definitions), another difference is the second snippet wouldn't compile, as there is no alias name. – WhozCraig Oct 15 '14 at 17:27
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1This isn't really a duplicate of http://stackoverflow.com/questions/612328/difference-between-struct-and-typedef-struct-in-c -- `struct` declarations behave differently in C++ than in C. – Keith Thompson Oct 15 '14 at 17:44
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1A `struct` declaration defines a new structure type. A `typedef` declaration merely creates a new name for an existing type. The syntax permits you to combine them into a single declaration. – Keith Thompson Oct 15 '14 at 17:46
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I've expanded on this in [this answer](http://stackoverflow.com/a/26389105/827263) that I just posted to [this question](http://stackoverflow.com/q/1675351/827263). – Keith Thompson Oct 15 '14 at 18:03
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First declares a structure tag foo while second define a structure type foo.
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1i.e. in the former your code would declare variable bar as struct foo bar; in the latter it would be foo bar. – Clarus Oct 15 '14 at 17:26
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