primitive_docs.rs.html -- source
Description: Source to the Rust file `/usr/obj/ports/rust-1.16.0/rustc-1.16.0-src/src/libstd/primitive_docs.rs`.
Keywords: rust, rustlang, rust-lang

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    // Copyright 2015 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.

    #[doc(primitive = "bool")]
    //
    /// The boolean type.
    ///
    /// The `bool` represents a value, which could only be either `true` or `false`. If you cast
    /// a `bool` into an integer, `true` will be 1 and `false` will be 0.
    ///
    /// # Basic usage
    ///
    /// `bool` implements various traits, such as [`BitAnd`], [`BitOr`], [`Not`], etc.,
    /// which allow us to perform boolean operations using `&`, `|` and `!`.
    ///
    /// [`if`] always demands a `bool` value. [`assert!`], being an important macro in testing,
    /// checks whether an expression returns `true`.
    ///
    /// ```
    /// let bool_val = true & false | false;
    /// assert!(!bool_val);
    /// ```
    ///
    /// [`assert!`]: macro.assert.html
    /// [`if`]: ../book/if.html
    /// [`BitAnd`]: ops/trait.BitAnd.html
    /// [`BitOr`]: ops/trait.BitOr.html
    /// [`Not`]: ops/trait.Not.html
    ///
    /// # Examples
    ///
    /// A trivial example of the usage of `bool`,
    ///
    /// ```
    /// let praise_the_borrow_checker = true;
    ///
    /// // using the `if` conditional
    /// if praise_the_borrow_checker {
    ///     println!("oh, yeah!");
    /// } else {
    ///     println!("what?!!");
    /// }
    ///
    /// // ... or, a match pattern
    /// match praise_the_borrow_checker {
    ///     true => println!("keep praising!"),
    ///     false => println!("you should praise!"),
    /// }
    /// ```
    ///
    /// Also, since `bool` implements the [`Copy`](marker/trait.Copy.html) trait, we don't
    /// have to worry about the move semantics (just like the integer and float primitives).
    ///
    /// Now an example of `bool` cast to integer type:
    ///
    /// ```
    /// assert_eq!(true as i32, 1);
    /// assert_eq!(false as i32, 0);
    /// ```
    #[stable(feature = "rust1", since = "1.0.0")]
    mod prim_bool { }

    #[doc(primitive = "char")]
    //
    /// A character type.
    ///
    /// The `char` type represents a single character. More specifically, since
    /// 'character' isn't a well-defined concept in Unicode, `char` is a '[Unicode
    /// scalar value]', which is similar to, but not the same as, a '[Unicode code
    /// point]'.
    ///
    /// [Unicode scalar value]: http://www.unicode.org/glossary/#unicode_scalar_value
    /// [Unicode code point]: http://www.unicode.org/glossary/#code_point
    ///
    /// This documentation describes a number of methods and trait implementations on the
    /// `char` type. For technical reasons, there is additional, separate
    /// documentation in [the `std::char` module](char/index.html) as well.
    ///
    /// # Representation
    ///
    /// `char` is always four bytes in size. This is a different representation than
    /// a given character would have as part of a [`String`]. For example:
    ///
    /// ```
    /// let v = vec!['h', 'e', 'l', 'l', 'o'];
    ///
    /// // five elements times four bytes for each element
    /// assert_eq!(20, v.len() * std::mem::size_of::<char>());
    ///
    /// let s = String::from("hello");
    ///
    /// // five elements times one byte per element
    /// assert_eq!(5, s.len() * std::mem::size_of::<u8>());
    /// ```
    ///
    /// [`String`]: string/struct.String.html
    ///
    /// As always, remember that a human intuition for 'character' may not map to
    /// Unicode's definitions. For example, emoji symbols such as '❤️' can be more
    /// than one Unicode code point; this ❤️ in particular is two:
    ///
    /// ```
    /// let s = String::from("❤️");
    ///
    /// // we get two chars out of a single ❤️
    /// let mut iter = s.chars();
    /// assert_eq!(Some('\u{2764}'), iter.next());
    /// assert_eq!(Some('\u{fe0f}'), iter.next());
    /// assert_eq!(None, iter.next());
    /// ```
    ///
    /// This means it won't fit into a `char`. Trying to create a literal with
    /// `let heart = '❤️';` gives an error:
    ///
    /// ```text
    /// error: character literal may only contain one codepoint: '❤
    /// let heart = '❤️';
    ///             ^~
    /// ```
    ///
    /// Another implication of the 4-byte fixed size of a `char` is that
    /// per-`char` processing can end up using a lot more memory:
    ///
    /// ```
    /// let s = String::from("love: ❤️");
    /// let v: Vec<char> = s.chars().collect();
    ///
    /// assert_eq!(12, s.len() * std::mem::size_of::<u8>());
    /// assert_eq!(32, v.len() * std::mem::size_of::<char>());
    /// ```
    #[stable(feature = "rust1", since = "1.0.0")]
    mod prim_char { }

    #[doc(primitive = "unit")]
    //
    /// The `()` type, sometimes called "unit" or "nil".
    ///
    /// The `()` type has exactly one value `()`, and is used when there
    /// is no other meaningful value that could be returned. `()` is most
    /// commonly seen implicitly: functions without a `-> ...` implicitly
    /// have return type `()`, that is, these are equivalent:
    ///
    /// ```rust
    /// fn long() -> () {}
    ///
    /// fn short() {}
    /// ```
    ///
    /// The semicolon `;` can be used to discard the result of an
    /// expression at the end of a block, making the expression (and thus
    /// the block) evaluate to `()`. For example,
    ///
    /// ```rust
    /// fn returns_i64() -> i64 {
    ///     1i64
    /// }
    /// fn returns_unit() {
    ///     1i64;
    /// }
    ///
    /// let is_i64 = {
    ///     returns_i64()
    /// };
    /// let is_unit = {
    ///     returns_i64();
    /// };
    /// ```
    ///
    #[stable(feature = "rust1", since = "1.0.0")]
    mod prim_unit { }

    #[doc(primitive = "pointer")]
    //
    /// Raw, unsafe pointers, `*const T`, and `*mut T`.
    ///
    /// Working with raw pointers in Rust is uncommon,
    /// typically limited to a few patterns.
    ///
    /// Use the `null` function to create null pointers, and the `is_null` method
    /// of the `*const T` type  to check for null. The `*const T` type also defines
    /// the `offset` method, for pointer math.
    ///
    /// # Common ways to create raw pointers
    ///
    /// ## 1. Coerce a reference (`&T`) or mutable reference (`&mut T`).
    ///
    /// ```
    /// let my_num: i32 = 10;
    /// let my_num_ptr: *const i32 = &my_num;
    /// let mut my_speed: i32 = 88;
    /// let my_speed_ptr: *mut i32 = &mut my_speed;
    /// ```
    ///
    /// To get a pointer to a boxed value, dereference the box:
    ///
    /// ```
    /// let my_num: Box<i32> = Box::new(10);
    /// let my_num_ptr: *const i32 = &*my_num;
    /// let mut my_speed: Box<i32> = Box::new(88);
    /// let my_speed_ptr: *mut i32 = &mut *my_speed;
    /// ```
    ///
    /// This does not take ownership of the original allocation
    /// and requires no resource management later,
    /// but you must not use the pointer after its lifetime.
    ///
    /// ## 2. Consume a box (`Box<T>`).
    ///
    /// The `into_raw` function consumes a box and returns
    /// the raw pointer. It doesn't destroy `T` or deallocate any memory.
    ///
    /// ```
    /// let my_speed: Box<i32> = Box::new(88);
    /// let my_speed: *mut i32 = Box::into_raw(my_speed);
    ///
    /// // By taking ownership of the original `Box<T>` though
    /// // we are obligated to put it together later to be destroyed.
    /// unsafe {
    ///     drop(Box::from_raw(my_speed));
    /// }
    /// ```
    ///
    /// Note that here the call to `drop` is for clarity - it indicates
    /// that we are done with the given value and it should be destroyed.
    ///
    /// ## 3. Get it from C.
    ///
    /// ```
    /// # #![feature(libc)]
    /// extern crate libc;
    ///
    /// use std::mem;
    ///
    /// fn main() {
    ///     unsafe {
    ///         let my_num: *mut i32 = libc::malloc(mem::size_of::<i32>()) as *mut i32;
    ///         if my_num.is_null() {
    ///             panic!("failed to allocate memory");
    ///         }
    ///         libc::free(my_num as *mut libc::c_void);
    ///     }
    /// }
    /// ```
    ///
    /// Usually you wouldn't literally use `malloc` and `free` from Rust,
    /// but C APIs hand out a lot of pointers generally, so are a common source
    /// of raw pointers in Rust.
    ///
    /// *[See also the `std::ptr` module](ptr/index.html).*
    ///
    #[stable(feature = "rust1", since = "1.0.0")]
    mod prim_pointer { }

    #[doc(primitive = "array")]
    //
    /// A fixed-size array, denoted `[T; N]`, for the element type, `T`, and the
    /// non-negative compile-time constant size, `N`.
    ///
    /// There are two syntactic forms for creating an array:
    ///
    /// * A list with each element, i.e. `[x, y, z]`.
    /// * A repeat expression `[x; N]`, which produces an array with `N` copies of `x`.
    ///   The type of `x` must be [`Copy`][copy].
    ///
    /// Arrays of sizes from 0 to 32 (inclusive) implement the following traits if
    /// the element type allows it:
    ///
    /// - [`Clone`][clone] (only if `T: [Copy][copy]`)
    /// - [`Debug`][debug]
    /// - [`IntoIterator`][intoiterator] (implemented for `&[T; N]` and `&mut [T; N]`)
    /// - [`PartialEq`][partialeq], [`PartialOrd`][partialord], [`Eq`][eq], [`Ord`][ord]
    /// - [`Hash`][hash]
    /// - [`AsRef`][asref], [`AsMut`][asmut]
    /// - [`Borrow`][borrow], [`BorrowMut`][borrowmut]
    /// - [`Default`][default]
    ///
    /// This limitation on the size `N` exists because Rust does not yet support
    /// code that is generic over the size of an array type. `[Foo; 3]` and `[Bar; 3]`
    /// are instances of same generic type `[T; 3]`, but `[Foo; 3]` and `[Foo; 5]` are
    /// entirely different types. As a stopgap, trait implementations are
    /// statically generated up to size 32.
    ///
    /// Arrays of *any* size are [`Copy`][copy] if the element type is [`Copy`][copy]. This
    /// works because the [`Copy`][copy] trait is specially known to the compiler.
    ///
    /// Arrays coerce to [slices (`[T]`)][slice], so a slice method may be called on
    /// an array. Indeed, this provides most of the API for working with arrays.
    /// Slices have a dynamic size and do not coerce to arrays.
    ///
    /// There is no way to move elements out of an array. See [`mem::replace`][replace]
    /// for an alternative.
    ///
    /// # Examples
    ///
    /// ```
    /// let mut array: [i32; 3] = [0; 3];
    ///
    /// array[1] = 1;
    /// array[2] = 2;
    ///
    /// assert_eq!([1, 2], &array[1..]);
    ///
    /// // This loop prints: 0 1 2
    /// for x in &array {
    ///     print!("{} ", x);
    /// }
    /// ```
    ///
    /// An array itself is not iterable:
    ///
    /// ```ignore
    /// let array: [i32; 3] = [0; 3];
    ///
    /// for x in array { }
    /// // error: the trait bound `[i32; 3]: std::iter::Iterator` is not satisfied
    /// ```
    ///
    /// The solution is to coerce the array to a slice by calling a slice method:
    ///
    /// ```
    /// # let array: [i32; 3] = [0; 3];
    /// for x in array.iter() { }
    /// ```
    ///
    /// If the array has 32 or fewer elements (see above), you can also use the
    /// array reference's [`IntoIterator`] implementation:
    ///
    /// ```
    /// # let array: [i32; 3] = [0; 3];
    /// for x in &array { }
    /// ```
    ///
    /// [slice]: primitive.slice.html
    /// [copy]: marker/trait.Copy.html
    /// [clone]: clone/trait.Clone.html
    /// [debug]: fmt/trait.Debug.html
    /// [intoiterator]: iter/trait.IntoIterator.html
    /// [partialeq]: cmp/trait.PartialEq.html
    /// [partialord]: cmp/trait.PartialOrd.html
    /// [eq]: cmp/trait.Eq.html
    /// [ord]: cmp/trait.Ord.html
    /// [hash]: hash/trait.Hash.html
    /// [asref]: convert/trait.AsRef.html
    /// [asmut]: convert/trait.AsMut.html
    /// [borrow]: borrow/trait.Borrow.html
    /// [borrowmut]: borrow/trait.BorrowMut.html
    /// [default]: default/trait.Default.html
    /// [replace]: mem/fn.replace.html
    /// [`IntoIterator`]: iter/trait.IntoIterator.html
    ///
    #[stable(feature = "rust1", since = "1.0.0")]
    mod prim_array { }

    #[doc(primitive = "slice")]
    //
    /// A dynamically-sized view into a contiguous sequence, `[T]`.
    ///
    /// Slices are a view into a block of memory represented as a pointer and a
    /// length.
    ///
    /// ```
    /// // slicing a Vec
    /// let vec = vec![1, 2, 3];
    /// let int_slice = &vec[..];
    /// // coercing an array to a slice
    /// let str_slice: &[&str] = &["one", "two", "three"];
    /// ```
    ///
    /// Slices are either mutable or shared. The shared slice type is `&[T]`,
    /// while the mutable slice type is `&mut [T]`, where `T` represents the element
    /// type. For example, you can mutate the block of memory that a mutable slice
    /// points to:
    ///
    /// ```
    /// let x = &mut [1, 2, 3];
    /// x[1] = 7;
    /// assert_eq!(x, &[1, 7, 3]);
    /// ```
    ///
    /// *[See also the `std::slice` module](slice/index.html).*
    ///
    #[stable(feature = "rust1", since = "1.0.0")]
    mod prim_slice { }

    #[doc(primitive = "str")]
    //
    /// String slices.
    ///
    /// The `str` type, also called a 'string slice', is the most primitive string
    /// type. It is usually seen in its borrowed form, `&str`. It is also the type
    /// of string literals, `&'static str`.
    ///
    /// Strings slices are always valid UTF-8.
    ///
    /// This documentation describes a number of methods and trait implementations
    /// on the `str` type. For technical reasons, there is additional, separate
    /// documentation in [the `std::str` module](str/index.html) as well.
    ///
    /// # Examples
    ///
    /// String literals are string slices:
    ///
    /// ```
    /// let hello = "Hello, world!";
    ///
    /// // with an explicit type annotation
    /// let hello: &'static str = "Hello, world!";
    /// ```
    ///
    /// They are `'static` because they're stored directly in the final binary, and
    /// so will be valid for the `'static` duration.
    ///
    /// # Representation
    ///
    /// A `&str` is made up of two components: a pointer to some bytes, and a
    /// length. You can look at these with the [`.as_ptr()`] and [`len()`] methods:
    ///
    /// ```
    /// use std::slice;
    /// use std::str;
    ///
    /// let story = "Once upon a time...";
    ///
    /// let ptr = story.as_ptr();
    /// let len = story.len();
    ///
    /// // story has nineteen bytes
    /// assert_eq!(19, len);
    ///
    /// // We can re-build a str out of ptr and len. This is all unsafe because
    /// // we are responsible for making sure the two components are valid:
    /// let s = unsafe {
    ///     // First, we build a &[u8]...
    ///     let slice = slice::from_raw_parts(ptr, len);
    ///
    ///     // ... and then convert that slice into a string slice
    ///     str::from_utf8(slice)
    /// };
    ///
    /// assert_eq!(s, Ok(story));
    /// ```
    ///
    /// [`.as_ptr()`]: #method.as_ptr
    /// [`len()`]: #method.len
    ///
    /// Note: This example shows the internals of `&str`. `unsafe` should not be
    /// used to get a string slice under normal circumstances. Use `.as_slice()`
    /// instead.
    #[stable(feature = "rust1", since = "1.0.0")]
    mod prim_str { }

    #[doc(primitive = "tuple")]
    //
    /// A finite heterogeneous sequence, `(T, U, ..)`.
    ///
    /// Let's cover each of those in turn:
    ///
    /// Tuples are *finite*. In other words, a tuple has a length. Here's a tuple
    /// of length `3`:
    ///
    /// ```
    /// ("hello", 5, 'c');
    /// ```
    ///
    /// 'Length' is also sometimes called 'arity' here; each tuple of a different
    /// length is a different, distinct type.
    ///
    /// Tuples are *heterogeneous*. This means that each element of the tuple can
    /// have a different type. In that tuple above, it has the type:
    ///
    /// ```rust,ignore
    /// (&'static str, i32, char)
    /// ```
    ///
    /// Tuples are a *sequence*. This means that they can be accessed by position;
    /// this is called 'tuple indexing', and it looks like this:
    ///
    /// ```rust
    /// let tuple = ("hello", 5, 'c');
    ///
    /// assert_eq!(tuple.0, "hello");
    /// assert_eq!(tuple.1, 5);
    /// assert_eq!(tuple.2, 'c');
    /// ```
    ///
    /// For more about tuples, see [the book](../book/primitive-types.html#tuples).
    ///
    /// # Trait implementations
    ///
    /// If every type inside a tuple implements one of the following traits, then a
    /// tuple itself also implements it.
    ///
    /// * [`Clone`]
    /// * [`Copy`]
    /// * [`PartialEq`]
    /// * [`Eq`]
    /// * [`PartialOrd`]
    /// * [`Ord`]
    /// * [`Debug`]
    /// * [`Default`]
    /// * [`Hash`]
    ///
    /// [`Clone`]: clone/trait.Clone.html
    /// [`Copy`]: marker/trait.Copy.html
    /// [`PartialEq`]: cmp/trait.PartialEq.html
    /// [`Eq`]: cmp/trait.Eq.html
    /// [`PartialOrd`]: cmp/trait.PartialOrd.html
    /// [`Ord`]: cmp/trait.Ord.html
    /// [`Debug`]: fmt/trait.Debug.html
    /// [`Default`]: default/trait.Default.html
    /// [`Hash`]: hash/trait.Hash.html
    ///
    /// Due to a temporary restriction in Rust's type system, these traits are only
    /// implemented on tuples of arity 12 or less. In the future, this may change.
    ///
    /// # Examples
    ///
    /// Basic usage:
    ///
    /// ```
    /// let tuple = ("hello", 5, 'c');
    ///
    /// assert_eq!(tuple.0, "hello");
    /// ```
    ///
    /// Tuples are often used as a return type when you want to return more than
    /// one value:
    ///
    /// ```
    /// fn calculate_point() -> (i32, i32) {
    ///     // Don't do a calculation, that's not the point of the example
    ///     (4, 5)
    /// }
    ///
    /// let point = calculate_point();
    ///
    /// assert_eq!(point.0, 4);
    /// assert_eq!(point.1, 5);
    ///
    /// // Combining this with patterns can be nicer.
    ///
    /// let (x, y) = calculate_point();
    ///
    /// assert_eq!(x, 4);
    /// assert_eq!(y, 5);
    /// ```
    ///
    #[stable(feature = "rust1", since = "1.0.0")]
    mod prim_tuple { }

    #[doc(primitive = "f32")]
    /// The 32-bit floating point type.
    ///
    /// *[See also the `std::f32` module](f32/index.html).*
    ///
    #[stable(feature = "rust1", since = "1.0.0")]
    mod prim_f32 { }

    #[doc(primitive = "f64")]
    //
    /// The 64-bit floating point type.
    ///
    /// *[See also the `std::f64` module](f64/index.html).*
    ///
    #[stable(feature = "rust1", since = "1.0.0")]
    mod prim_f64 { }

    #[doc(primitive = "i8")]
    //
    /// The 8-bit signed integer type.
    ///
    /// *[See also the `std::i8` module](i8/index.html).*
    ///
    /// However, please note that examples are shared between primitive integer
    /// types. So it's normal if you see usage of types like `i64` in there.
    ///
    #[stable(feature = "rust1", since = "1.0.0")]
    mod prim_i8 { }

    #[doc(primitive = "i16")]
    //
    /// The 16-bit signed integer type.
    ///
    /// *[See also the `std::i16` module](i16/index.html).*
    ///
    /// However, please note that examples are shared between primitive integer
    /// types. So it's normal if you see usage of types like `i32` in there.
    ///
    #[stable(feature = "rust1", since = "1.0.0")]
    mod prim_i16 { }

    #[doc(primitive = "i32")]
    //
    /// The 32-bit signed integer type.
    ///
    /// *[See also the `std::i32` module](i32/index.html).*
    ///
    /// However, please note that examples are shared between primitive integer
    /// types. So it's normal if you see usage of types like `i16` in there.
    ///
    #[stable(feature = "rust1", since = "1.0.0")]
    mod prim_i32 { }

    #[doc(primitive = "i64")]
    //
    /// The 64-bit signed integer type.
    ///
    /// *[See also the `std::i64` module](i64/index.html).*
    ///
    /// However, please note that examples are shared between primitive integer
    /// types. So it's normal if you see usage of types like `i8` in there.
    ///
    #[stable(feature = "rust1", since = "1.0.0")]
    mod prim_i64 { }

    #[doc(primitive = "i128")]
    //
    /// The 128-bit signed integer type.
    ///
    /// *[See also the `std::i128` module](i128/index.html).*
    ///
    /// However, please note that examples are shared between primitive integer
    /// types. So it's normal if you see usage of types like `i8` in there.
    ///
    #[unstable(feature = "i128", issue="35118")]
    mod prim_i128 { }

    #[doc(primitive = "u8")]
    //
    /// The 8-bit unsigned integer type.
    ///
    /// *[See also the `std::u8` module](u8/index.html).*
    ///
    /// However, please note that examples are shared between primitive integer
    /// types. So it's normal if you see usage of types like `u64` in there.
    ///
    #[stable(feature = "rust1", since = "1.0.0")]
    mod prim_u8 { }

    #[doc(primitive = "u16")]
    //
    /// The 16-bit unsigned integer type.
    ///
    /// *[See also the `std::u16` module](u16/index.html).*
    ///
    /// However, please note that examples are shared between primitive integer
    /// types. So it's normal if you see usage of types like `u32` in there.
    ///
    #[stable(feature = "rust1", since = "1.0.0")]
    mod prim_u16 { }

    #[doc(primitive = "u32")]
    //
    /// The 32-bit unsigned integer type.
    ///
    /// *[See also the `std::u32` module](u32/index.html).*
    ///
    /// However, please note that examples are shared between primitive integer
    /// types. So it's normal if you see usage of types like `u16` in there.
    ///
    #[stable(feature = "rust1", since = "1.0.0")]
    mod prim_u32 { }

    #[doc(primitive = "u64")]
    //
    /// The 64-bit unsigned integer type.
    ///
    /// *[See also the `std::u64` module](u64/index.html).*
    ///
    /// However, please note that examples are shared between primitive integer
    /// types. So it's normal if you see usage of types like `u8` in there.
    ///
    #[stable(feature = "rust1", since = "1.0.0")]
    mod prim_u64 { }

    #[doc(primitive = "u128")]
    //
    /// The 128-bit unsigned integer type.
    ///
    /// *[See also the `std::u128` module](u128/index.html).*
    ///
    /// However, please note that examples are shared between primitive integer
    /// types. So it's normal if you see usage of types like `u8` in there.
    ///
    #[unstable(feature = "i128", issue="35118")]
    mod prim_u128 { }

    #[doc(primitive = "isize")]
    //
    /// The pointer-sized signed integer type.
    ///
    /// *[See also the `std::isize` module](isize/index.html).*
    ///
    /// However, please note that examples are shared between primitive integer
    /// types. So it's normal if you see usage of types like `usize` in there.
    ///
    #[stable(feature = "rust1", since = "1.0.0")]
    mod prim_isize { }

    #[doc(primitive = "usize")]
    //
    /// The pointer-sized unsigned integer type.
    ///
    /// *[See also the `std::usize` module](usize/index.html).*
    ///
    /// However, please note that examples are shared between primitive integer
    /// types. So it's normal if you see usage of types like `isize` in there.
    ///
    #[stable(feature = "rust1", since = "1.0.0")]
    mod prim_usize { }

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