read_only_collection.cpp

Shows how to use xtd::collections::object_model::read_only_collection class.

#include <xtd/xtd>
 
class example {
public:
  static auto main() -> void {
    auto dinosaurs = list<string> {};
    
    dinosaurs.add("Tyrannosaurus");
    dinosaurs.add("Amargasaurus");
    dinosaurs.add("Deinonychus");
    dinosaurs.add("Compsognathus");
 
    auto read_only_dinosaurs = dinosaurs.as_read_only();
 
    for (auto dinosaur : read_only_dinosaurs)
      console::write_line(dinosaur);
    
    console::write_line("\ncount: {0}", read_only_dinosaurs.count());
    
    console::write_line("\ncontains(\"Deinonychus\"): {0}", dinosaurs.contains("Deinonychus"));
    
    console::write_line("\nread_only_dinosaurs[3]: {0}", dinosaurs[3]);
    
    console::write_line("\nindex_of(\"Compsognathus\"): {0}", read_only_dinosaurs.index_of("Compsognathus"));
    
    console::write_line("\nInsert into the wrapped List:");
    console::write_line("insert(2, \"Oviraptor\")");
    dinosaurs.insert(2, "Oviraptor");
    
    console::write_line();
    for (auto dinosaur : read_only_dinosaurs)
      console::write_line(dinosaur);
 
    auto dino_array = array<string>(read_only_dinosaurs.count() + 2);
    read_only_dinosaurs.copy_to(dino_array, 1);
    
    console::write_line("\nCopied array has {0} elements:", dino_array.length());
    for (auto dinosaur : dino_array )
      console::write_line("\"{0}\"", dinosaur);
  }
};
 
startup_(example::main);
 
// This code produces the following output :
//
// Tyrannosaurus
// Amargasaurus
// Deinonychus
// Compsognathus
//
// count: 4
//
// contains("Deinonychus"): true
//
// read_only_dinosaurs[3]: Compsognathus
//
// index_of("Compsognathus"): 3
//
// Insert into the wrapped List:
// insert(2, "Oviraptor")
//
// Tyrannosaurus
// Amargasaurus
// Oviraptor
// Deinonychus
// Compsognathus
//
// Copied array has 7 elements:
// ""
// "Tyrannosaurus"
// "Amargasaurus"
// "Oviraptor"
// "Deinonychus"
// "Compsognathus"
// ""