c_ulong in std::ffi - Rust
Description: Equivalent to C’s `unsigned long` type.

## c_ulong

# Type Alias c_ulong

1.64.0 · Source

    pub type c_ulong = u32;

Expand description

Equivalent to C’s `unsigned long` type.

This type will always be `u32` or `u64`. Most notably, many Linux-based systems assume an `u64`, but Windows assumes `u32`. The C standard technically only requires that this type be an unsigned integer with the size of a `long`, although in practice, no system would have a `ulong` that is neither a `u32` nor `u64`.