The document of lua_pushcfunction

[云风 <cloudwu@...>]

I read http://www.lua.org/manual/5.3/manual.html#lua_pushcfunction

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lua_pushcfunction is defined as a macro:

     #define lua_pushcfunction(L,f)  lua_pushcclosure(L,f,0)

Note that f is used twice.
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Why f is used twice ? I saw only once.

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