boost::ptr_vector 習作

#include <iostream>
#include <algorithm>
#include <boost/ptr_container/ptr_vector.hpp>


class Foo {
public:
 int a_;
  Foo(int i) : a_(i) { std::cout << "Foo()" << std::endl; }
  ~Foo() { std::cout << "~Foo()" << std::endl; }
};

void show( const Foo& f ) {
  std::cout << f.a_ << ",";
}

int main() {
  {

    boost::ptr_vector<Foo> v;


    for( int i = 0; i < 10; ++i ) {
      v.push_back( new Foo(i) );
    }

    std::for_each(v.begin(), v.end(), show ); 
    std::cout << std::endl << "scope exit..." << std::endl;
  }
  std::cout << std::endl << "out of scope..." << std::endl;
  return 0;
}

実行結果

Foo()
Foo()
Foo()
Foo()
Foo()
Foo()
Foo()
Foo()
Foo()
Foo()
0,1,2,3,4,5,6,7,8,9,
scope exit...
~Foo()
~Foo()
~Foo()
~Foo()
~Foo()
~Foo()
~Foo()
~Foo()
~Foo()
~Foo()

out of scope...

細かいメタ関数を用意しなくて済むので、便利だ。