ceph/src/boost/libs/container/example/doc_type_erasure.cpp

   1 //////////////////////////////////////////////////////////////////////////////
   2 //
   3 // (C) Copyright Ion Gaztanaga 2009-2013. Distributed under the Boost
   4 // Software License, Version 1.0. (See accompanying file
   5 // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   6 //
   7 // See http://www.boost.org/libs/container for documentation.
   8 //
   9 //////////////////////////////////////////////////////////////////////////////
  10
  11 //[doc_type_erasure_MyClassHolder_h
  12 #include <boost/container/vector.hpp>
  13
  14 //MyClassHolder.h
  15
  16 //We don't need to include "MyClass.h"
  17 //to store vector<MyClass>
  18 class MyClass;
  19
  20 class MyClassHolder
  21 {
  22    public:
  23
  24    void AddNewObject(const MyClass &o);
  25    const MyClass & GetLastObject() const;
  26
  27    private:
  28    ::boost::container::vector<MyClass> vector_;
  29 };
  30
  31 //]
  32
  33 //[doc_type_erasure_MyClass_h
  34
  35 //MyClass.h
  36
  37 class MyClass
  38 {
  39    private:
  40    int value_;
  41
  42    public:
  43    MyClass(int val = 0) : value_(val){}
  44
  45    friend bool operator==(const MyClass &l, const MyClass &r)
  46    {  return l.value_ == r.value_;  }
  47    //...
  48 };
  49
  50 //]
  51
  52
  53
  54 //[doc_type_erasure_main_cpp
  55
  56 //Main.cpp
  57
  58 //=#include "MyClassHolder.h"
  59 //=#include "MyClass.h"
  60
  61 #include <cassert>
  62
  63 int main()
  64 {
  65    MyClass mc(7);
  66    MyClassHolder myclassholder;
  67    myclassholder.AddNewObject(mc);
  68    return myclassholder.GetLastObject() == mc ? 0 : 1;
  69 }
  70 //]
  71
  72 //[doc_type_erasure_MyClassHolder_cpp
  73
  74 //MyClassHolder.cpp
  75
  76 //=#include "MyClassHolder.h"
  77
  78 //In the implementation MyClass must be a complete
  79 //type so we include the appropriate header
  80 //=#include "MyClass.h"
  81
  82 void MyClassHolder::AddNewObject(const MyClass &o)
  83 {  vector_.push_back(o);  }
  84
  85 const MyClass & MyClassHolder::GetLastObject() const
  86 {  return vector_.back();  }
  87
  88 //]