routing 0.1.71

// Copyright 2015 MaidSafe.net limited.
//
// This SAFE Network Software is licensed to you under (1) the MaidSafe.net Commercial License,
// version 1.0 or later, or (2) The General Public License (GPL), version 3, depending on which
// licence you accepted on initial access to the Software (the "Licences").
//
// By contributing code to the SAFE Network Software, or to this project generally, you agree to be
// bound by the terms of the MaidSafe Contributor Agreement, version 1.0.  This, along with the
// Licenses can be found in the root directory of this project at LICENSE, COPYING and CONTRIBUTOR.
//
// Unless required by applicable law or agreed to in writing, the SAFE Network Software distributed
// under the GPL Licence is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.
//
// Please review the Licences for the specific language governing permissions and limitations
// relating to use of the SAFE Network Software.

#![macro_use]

/// Convert a container of `u8`s to an array.  If the container is not the exact size specified,
/// `None` is returned.  Otherwise, all of the elements are moved into the array.
///
/// ## Examples
///
/// ```
/// # #[macro_use] extern crate routing;
/// # fn main() {
/// let mut data = Vec::<u8>::new();
/// data.push(1);
/// data.push(2);
/// let data_copy = data.clone();
/// assert!(container_of_u8_to_array!(data, 2).is_some());
/// assert!(container_of_u8_to_array!(data_copy, 3).is_none());
/// # }
/// ```
#[macro_export]
macro_rules! container_of_u8_to_array {
    ($container:ident, $size:expr) => {{
        if $container.len() != $size {
            None
        } else {
            let mut arr = [0u8; $size];
            for element in $container.into_iter().enumerate() {
                arr[element.0] = element.1;
            }
            Some(arr)
        }
    }};
}