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rust/library/core/src/ffi/c_float.md
Josh Triplett 335c9609c6 Provide C FFI types via core::ffi, not just in std 
The ability to interoperate with C code via FFI is not limited to crates
using std; this allows using these types without std.

The existing types in `std::os::raw` become type aliases for the ones in
`core::ffi`. This uses type aliases rather than re-exports, to allow the
std types to remain stable while the core types are unstable.

This also moves the currently unstable `NonZero_` variants and
`c_size_t`/`c_ssize_t`/`c_ptrdiff_t` types to `core::ffi`, while leaving
them unstable.
2022-03-01 17:16:05 -08:00

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Equivalent to C's float type.

This type will almost always be [f32], which is guaranteed to be an IEEE-754 single-precision float in Rust. That said, the standard technically only guarantees that it be a floating-point number, and it may have less precision than f32 or not follow the IEEE-754 standard at all.