list() [6/15]

template<typename type_t , typename allocator_t = xtd::collections::generic::helpers::allocator<typename std::conditional<std::is_same<bool, type_t>::value, char, type_t>::type>>

xtd::collections::generic::list< type_t, allocator_t >::list ( const xtd::collections::generic::ienumerable< type_t > &  collection, const allocator_type &  alloc = allocator_type()  )

inline

Initializes a new instance of the xtd::collections::generic::list <type_t> class that contains elements copied from the specified collection and has sufficient capacity to accommodate the number of elements copied.

Parameters

collection	The collection whose elements are copied to the new list.
alloc	The allocator to use for all memory allocations of this container.

Examples

The following code example demonstrates the xtd::collections::generic::list <type_t> constructor and various methods of the xtd::collections::generic::list <type_t> class that act on ranges. An array of strings is created and passed to the constructor, populating the list with the elements of the array. The xtd::collections::generic::list::capacity property is then displayed, to show that the initial capacity is exactly what is required to hold the input elements.

#include <xtd/xtd>
 
using namespace xtd;
using namespace xtd::collections::generic;
 
class example {
public:
  static auto main() -> void {
    auto input = array<string> {"Brachiosaurus", "Amargasaurus", "Mamenchisaurus"};
    
    auto dinosaurs = list<string>(input);
    
    console::write_line("\ncapacity: {0}", dinosaurs.capacity());
    
    console::write_line();
    for (auto dinosaur : dinosaurs)
      console::write_line(dinosaur);
    
    console::write_line("\nadd_range(dinosaurs)");
    dinosaurs.add_range(dinosaurs);
    
    console::write_line();
    for(auto dinosaur : dinosaurs)
      console::write_line(dinosaur);
    
    console::write_line("\nremove_range(2, 2)");
    dinosaurs.remove_range(2, 2);
    
    console::write_line();
    for(auto dinosaur : dinosaurs)
      console::write_line(dinosaur);
    
    input = {"Tyrannosaurus", "Deinonychus", "Velociraptor"};
    console::write_line("\ninsert_range(3, input)");
    dinosaurs.insert_range(3, input);
    
    console::write_line();
    for(auto dinosaur : dinosaurs)
      console::write_line(dinosaur);
    
    console::write_line("\noutput = dinosaurs.get_range(2, 3).to_array()");
    auto output = dinosaurs.get_range(2, 3).to_array();
    
    console::write_line();
    for (auto dinosaur : output)
      console::write_line(dinosaur);
  }
};
 
startup_(example::main);
 
// This code produces the following output :
//
//
// capacity: 3
//
// Brachiosaurus
// Amargasaurus
// Mamenchisaurus
//
// add_range(dinosaurs)
//
// Brachiosaurus
// Amargasaurus
// Mamenchisaurus
// Brachiosaurus
// Amargasaurus
// Mamenchisaurus
//
// remove_range(2, 2)
//
// Brachiosaurus
// Amargasaurus
// Amargasaurus
// Mamenchisaurus
//
// insert_range(3, input)
//
// Brachiosaurus
// Amargasaurus
// Amargasaurus
// Tyrannosaurus
// Deinonychus
// Velociraptor
// Mamenchisaurus
//
// output = dinosaurs.get_range(2, 3).to_array()
//
// Amargasaurus
// Tyrannosaurus
// Deinonychus

Remarks

The elements are copied onto the xtd::collections::generic::list <type_t> in the same order they are read by the enumerator of the collection.

This constructor is an O(n) operation, where n is the number of elements in collection.