Function init_float 

pub unsafe extern "C" fn init_float(
    context: *mut c_context,
    value: *mut value,
    d: f64,
) -> err

@brief Set a float @ingroup value_create @param[out] context Optional, stores error information @param[out] value Nix value to modify @param[in] d the float, 64-bits @return error code, NIX_OK on success.