Boost学习笔记之any

最新推荐文章于 2025-06-11 21:14:53 发布

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#function #class #pair #string #each #c

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本文介绍如何利用Boost::Any库在C++中处理不同类型的对象，通过简单的代码示例展示如何将多种数据类型存储在一个容器中，并根据不同类型调用相应的函数。

any是任意对象。配合使用STL容器点，可向此容器添加任意类型的对象。

#include <iostream>
#include <string>
#include <utility>
#include <vector>
#include "boost/any.hpp"
using namespace std;

class A{
public:
     void some_function(){
         cout << "A::some_function()" << endl;
     }
 };
 
 class B{
 public:
     void some_function(){
         cout << "B::some_function()" << endl;
     }
 };
 
 class C{
 public:
     void some_function(){
         cout << "C::some_function()" << endl;
     }
 };
 
 void print_any(boost::any& a){
     if(A* pA = boost::any_cast<A>(&a))
     {
         pA->some_function();
     }
     else if(B* pB = boost::any_cast<B>(&a))
     {
         pB->some_function();
     }
     else if(C* pC = boost::any_cast<C>(&a))
     {
         pC->some_function();
     }
 }
 
 int main(){
     cout << "Example of using any" << endl;
     vector<boost::any> store_anything;
 
     store_anything.push_back(A());
     store_anything.push_back(B());
     store_anything.push_back(C());
 
     store_anything.push_back(string("This is great!"));
     store_anything.push_back(3);
     store_anything.push_back(make_pair(true, 7.92));
 
     void print_any(boost::any& a);
 
     for_each(store_anything.begin(), store_anything.end(), print_any);
 
     cin.get();
 }