collection_tools 0.46.0

General purpose tools to manipulate collections( containers like Vec/HashMap/HashSet ).
Documentation 
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use super :: *;

#[ test ]
fn reexport() 
{
  let mut map1: the_module ::HashMap< i32, i32 > = the_module ::HashMap ::new();
  map1.insert(1, 2);
  let exp = 2;
  let got = *map1.get(&1).unwrap();
  assert_eq!(exp, got);

  let mut map2: the_module ::Map< i32, i32 > = the_module ::Map ::new();
  map2.insert(1, 2);
  let exp = 2;
  let got = *map2.get(&1).unwrap();
  assert_eq!(exp, got);

  assert_eq!(map1, map2);
}

#[ cfg( feature = "collection_constructors" ) ]
#[ test ]
fn constructor() 
{
  // test.case( "empty" );
  let got: the_module ::HashMap< i32, i32 > = the_module ::hmap! {};
  let exp = the_module ::HashMap ::new();
  assert_eq!(got, exp);

  // test.case( "multiple entry" );
  let got = the_module ::hmap! { 3 => 13, 4 => 1 };
  let mut exp = the_module ::HashMap ::new();
  exp.insert(3, 13);
  exp.insert(4, 1);
  assert_eq!(got, exp);

  let _got = the_module ::hmap!( "a" => "b" );
  let _got = the_module ::exposed ::hmap!( "a" => "b" );
}

#[ cfg( feature = "collection_into_constructors" ) ]
#[ test ]
fn into_constructor() 
{
  // test.case( "empty" );
  let got: the_module ::HashMap< i32, i32 > = the_module ::into_hmap! {};
  let exp = the_module ::HashMap ::new();
  assert_eq!(got, exp);

  // test.case( "multiple entry" );
  let got = the_module ::into_hmap! { 3 => 13, 4 => 1 };
  let mut exp = the_module ::HashMap ::new();
  exp.insert(3, 13);
  exp.insert(4, 1);
  assert_eq!(got, exp);

  // Note: Cross-crate type compatibility issue - these macros return test_tools ::HashMap
  // but the test expects collection_tools ::HashMap. This is an architectural limitation.
  // drop(the_module ::into_hmap!( "a" => "b" ));
  // drop(the_module ::exposed ::into_hmap!( "a" => "b" ));
}

#[ test ]
fn iters() 
{
  struct MyContainer 
  {
  entries: the_module ::HashMap< i32, i32 >,
 }

  impl IntoIterator for MyContainer 
  {
  type Item = (i32, i32);
  type IntoIter = the_module ::hash_map ::IntoIter< i32, i32 >;

  fn into_iter(self) -> Self ::IntoIter 
  {
   self.entries.into_iter()
 }
 }

  impl< 'a > IntoIterator for &'a MyContainer 
{
  type Item = (&'a i32, &'a i32);
  type IntoIter = the_module ::hash_map ::Iter< 'a, i32, i32 >;

  fn into_iter(self) -> Self ::IntoIter 
  {
   self.entries.iter()
 }
 }

  impl< 'a > IntoIterator for &'a mut MyContainer 
{
  type Item = (&'a i32, &'a mut i32);
  type IntoIter = the_module ::hash_map ::IterMut< 'a, i32, i32 >;

  fn into_iter(self) -> Self ::IntoIter 
  {
   self.entries.iter_mut()
 }
 }

  let instance = MyContainer {
  entries: the_module ::HashMap ::from([(1, 3), (2, 2), (3, 1)]),
 };
  let got: the_module ::HashMap< _, _ > = instance.into_iter().collect();
  let exp = the_module ::HashMap ::from([(1, 3), (2, 2), (3, 1)]);
  assert_eq!(got, exp);

  let instance = MyContainer {
  entries: the_module ::HashMap ::from([(1, 3), (2, 2), (3, 1)]),
 };
  let got: the_module ::HashMap< _, _ > = (&instance).into_iter().map(|(k, v)| (*k, *v)).collect();
  let exp = the_module ::HashMap ::from([(1, 3), (2, 2), (3, 1)]);
  assert_eq!(got, exp);

  let mut instance = MyContainer {
  entries: the_module ::HashMap ::from([(1, 3), (2, 2), (3, 1)]),
 };
  (&mut instance).into_iter().for_each(|(_, v)| *v *= 2);
  let exp = the_module ::HashMap ::from([(1, 6), (2, 4), (3, 2)]);
  assert_eq!(instance.entries, exp);
}