c_long in std::ffi - Rust
Description: Equivalent to C’s `signed long` (`long`) type.
Keywords: rust, rustlang, rust-lang, c_long

# Type Definition std::ffi::c_long

1.64.0 · source · [−]

    pub type c_long = i64;

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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`.