tests/rustdoc/const-generics/const-generics-docs.rs

   1 // edition:2018
   2 // aux-build: extern_crate.rs
   3 #![crate_name = "foo"]
   4
   5 extern crate extern_crate;
   6 // @has foo/fn.extern_fn.html '//div[@class="item-decl"]/pre[@class="rust"]' \
   7 //      'pub fn extern_fn<const N: usize>() -> impl Iterator<Item = [u8; N]>'
   8 pub use extern_crate::extern_fn;
   9 // @has foo/struct.ExternTy.html '//div[@class="item-decl"]/pre[@class="rust"]' \
  10 //      'pub struct ExternTy<const N: usize> {'
  11 pub use extern_crate::ExternTy;
  12 // @has foo/type.TyAlias.html '//div[@class="item-decl"]/pre[@class="rust"]' \
  13 //      'type TyAlias<const N: usize> = ExternTy<N>;'
  14 pub use extern_crate::TyAlias;
  15 // @has foo/trait.WTrait.html '//div[@class="item-decl"]/pre[@class="rust"]' \
  16 //      'pub trait WTrait<const N: usize, const M: usize>'
  17 // @has - '//div[@class="item-decl"]/pre[@class="rust"]' 'fn hey<const P: usize>() -> usize'
  18 pub use extern_crate::WTrait;
  19
  20 // @has foo/trait.Trait.html '//div[@class="item-decl"]/pre[@class="rust"]' \
  21 //      'pub trait Trait<const N: usize>'
  22 // @has - '//*[@id="impl-Trait%3C1%3E-for-u8"]//h3[@class="code-header"]' 'impl Trait<1> for u8'
  23 // @has - '//*[@id="impl-Trait%3C2%3E-for-u8"]//h3[@class="code-header"]' 'impl Trait<2> for u8'
  24 // @has - '//*[@id="impl-Trait%3C{1%20+%202}%3E-for-u8"]//h3[@class="code-header"]' 'impl Trait<{1 + 2}> for u8'
  25 // @has - '//*[@id="impl-Trait%3CN%3E-for-%5Bu8%3B%20N%5D"]//h3[@class="code-header"]' \
  26 //      'impl<const N: usize> Trait<N> for [u8; N]'
  27 pub trait Trait<const N: usize> {}
  28 impl Trait<1> for u8 {}
  29 impl Trait<2> for u8 {}
  30 impl Trait<{1 + 2}> for u8 {}
  31 impl<const N: usize> Trait<N> for [u8; N] {}
  32
  33 // @has foo/struct.Foo.html '//div[@class="item-decl"]/pre[@class="rust"]' \
  34 //      'pub struct Foo<const N: usize>where u8: Trait<N>'
  35 pub struct Foo<const N: usize> where u8: Trait<N>;
  36 // @has foo/struct.Bar.html '//div[@class="item-decl"]/pre[@class="rust"]' 'pub struct Bar<T, const N: usize>(_)'
  37 pub struct Bar<T, const N: usize>([T; N]);
  38
  39 // @has foo/struct.Foo.html '//*[@id="impl-Foo%3CM%3E"]/h3[@class="code-header"]' 'impl<const M: usize> Foo<M>where u8: Trait<M>'
  40 impl<const M: usize> Foo<M> where u8: Trait<M> {
  41     // @has - '//*[@id="associatedconstant.FOO_ASSOC"]' 'pub const FOO_ASSOC: usize'
  42     pub const FOO_ASSOC: usize = M + 13;
  43
  44     // @has - '//*[@id="method.hey"]' 'pub fn hey<const N: usize>(&self) -> Bar<u8, N>'
  45     pub fn hey<const N: usize>(&self) -> Bar<u8, N> {
  46         Bar([0; N])
  47     }
  48 }
  49
  50 // @has foo/struct.Bar.html '//*[@id="impl-Bar%3Cu8%2C%20M%3E"]/h3[@class="code-header"]' 'impl<const M: usize> Bar<u8, M>'
  51 impl<const M: usize> Bar<u8, M> {
  52     // @has - '//*[@id="method.hey"]' \
  53     //      'pub fn hey<const N: usize>(&self) -> Foo<N>where u8: Trait<N>'
  54     pub fn hey<const N: usize>(&self) -> Foo<N> where u8: Trait<N> {
  55         Foo
  56     }
  57 }
  58
  59 // @has foo/fn.test.html '//div[@class="item-decl"]/pre[@class="rust"]' \
  60 //      'pub fn test<const N: usize>() -> impl Trait<N>where u8: Trait<N>'
  61 pub fn test<const N: usize>() -> impl Trait<N> where u8: Trait<N> {
  62     2u8
  63 }
  64
  65 // @has foo/fn.a_sink.html '//div[@class="item-decl"]/pre[@class="rust"]' \
  66 //      'pub async fn a_sink<const N: usize>(v: [u8; N]) -> impl Trait<N>'
  67 pub async fn a_sink<const N: usize>(v: [u8; N]) -> impl Trait<N> {
  68     v
  69 }
  70
  71 // @has foo/fn.b_sink.html '//div[@class="item-decl"]/pre[@class="rust"]' \
  72 //      'pub async fn b_sink<const N: usize>(_: impl Trait<N>)'
  73 pub async fn b_sink<const N: usize>(_: impl Trait<N>) {}
  74
  75 // @has foo/fn.concrete.html '//div[@class="item-decl"]/pre[@class="rust"]' \
  76 //      'pub fn concrete() -> [u8; 22]'
  77 pub fn concrete() -> [u8; 3 + std::mem::size_of::<u64>() << 1] {
  78     Default::default()
  79 }
  80
  81 // @has foo/type.Faz.html '//div[@class="item-decl"]/pre[@class="rust"]' \
  82 //      'type Faz<const N: usize> = [u8; N];'
  83 pub type Faz<const N: usize> = [u8; N];
  84 // @has foo/type.Fiz.html '//div[@class="item-decl"]/pre[@class="rust"]' \
  85 //      'type Fiz<const N: usize> = [[u8; N]; 48];'
  86 pub type Fiz<const N: usize> = [[u8; N]; 3 << 4];
  87
  88 macro_rules! define_me {
  89     ($t:tt<$q:tt>) => {
  90         pub struct $t<const $q: usize>([u8; $q]);
  91     }
  92 }
  93
  94 // @has foo/struct.Foz.html '//div[@class="item-decl"]/pre[@class="rust"]' \
  95 //      'pub struct Foz<const N: usize>(_);'
  96 define_me!(Foz<N>);
  97
  98 trait Q {
  99     const ASSOC: usize;
 100 }
 101
 102 impl<const N: usize> Q for [u8; N] {
 103     const ASSOC: usize = N;
 104 }
 105
 106 // @has foo/fn.q_user.html '//div[@class="item-decl"]/pre[@class="rust"]' \
 107 //      'pub fn q_user() -> [u8; 13]'
 108 pub fn q_user() -> [u8; <[u8; 13] as Q>::ASSOC] {
 109     [0; <[u8; 13] as Q>::ASSOC]
 110 }
 111
 112 // @has foo/union.Union.html '//div[@class="item-decl"]/pre[@class="rust"]' \
 113 //      'pub union Union<const N: usize>'
 114 pub union Union<const N: usize> {
 115     // @has - //pre "pub arr: [u8; N]"
 116     pub arr: [u8; N],
 117     // @has - //pre "pub another_arr: [(); N]"
 118     pub another_arr: [(); N],
 119 }
 120
 121 // @has foo/enum.Enum.html '//div[@class="item-decl"]/pre[@class="rust"]' \
 122 //      'pub enum Enum<const N: usize>'
 123 pub enum Enum<const N: usize> {
 124     // @has - //pre "Variant([u8; N])"
 125     Variant([u8; N]),
 126     // @has - //pre "EmptyVariant"
 127     EmptyVariant,
 128 }