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c_long
source link: https://doc.rust-lang.org/stable/std/ffi/type.c_long.html
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pub type c_long = i64;Equivalent to C’s signed long (long) type.
This type will always be i32 or i64. Most notably, many Linux-based systems assume an i64, but Windows assumes i32. The C standard technically only requires that this type be a signed integer that is at least 32 bits and at least the size of an int, although in practice, no system would have a long that is neither an i32 nor i64.
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