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    // Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT
    // file at the top-level directory of this distribution and at
    // http://rust-lang.org/COPYRIGHT.
    //
    // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
    // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
    // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
    // option. This file may not be copied, modified, or distributed
    // except according to those terms.

    //! Support code for encoding and decoding types.
    //!
    //! > **NOTE**: This crate is deprecated in favor of [`serde`]. No new feature
    //! > development will happen in this crate, although bug fixes proposed through
    //! > PRs will still be merged. It is very highly recommended by the Rust
    //! > Library Team that you use [`serde`], not this crate.
    //!
    //! [`serde`]: https://serde.rs
    //!
    //! # Usage
    //!
    //! This crate is [on crates.io](https://crates.io/crates/rustc-serialize) and
    //! can be used by adding `rustc-serialize` to the dependencies in your
    //! project's `Cargo.toml`.
    //!
    //! ```toml
    //! [dependencies]
    //! rustc-serialize = "0.3"
    //! ```
    //!
    //! and this to your crate root:
    //!
    //! ```rust
    //! extern crate rustc_serialize;
    //! ```

    #![cfg_attr(rustbuild, feature(staged_api, rustc_private))]
    #![cfg_attr(rustbuild, unstable(feature = "rustc_private", issue = "27812"))]

    #![doc(html_logo_url = "https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png",
           html_favicon_url = "https://www.rust-lang.org/favicon.ico",
           html_root_url = "https://doc.rust-lang.org/rustc-serialize/")]
    #![cfg_attr(test, deny(warnings))]
    #![allow(trivial_numeric_casts)]
    #![cfg_attr(rust_build, feature(staged_api))]
    #![cfg_attr(rust_build, staged_api)]
    #![cfg_attr(rust_build,
                unstable(feature = "rustc_private",
                         reason = "use the crates.io `rustc-serialize` library instead"))]

    #[cfg(test)] extern crate rand;

    pub use self::serialize::{Decoder, Encoder, Decodable, Encodable,
                              DecoderHelpers, EncoderHelpers};

    // Limit collections from allocating more than
    // 1 MB for calls to `with_capacity`.
    fn cap_capacity<T>(given_len: usize) -> usize {
        use std::cmp::min;
        use std::mem::size_of;
        const PRE_ALLOCATE_CAP: usize = 0x100000;

        match size_of::<T>() {
            0 => min(given_len, PRE_ALLOCATE_CAP),
            n => min(given_len, PRE_ALLOCATE_CAP / n)
        }
    }

    mod serialize;
    mod collection_impls;

    pub mod base64;
    pub mod hex;
    pub mod json;

    mod rustc_serialize {
        pub use serialize::*;
    }

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