boost的Any库学习
http://www.stlchina.org/twiki/bin/view.pl/Main/BoostSource_any ppLiu写的关于这个的文章
下面是实例代码
1.
int main()
{
boost::any a;
a = std::string("aaaa");
try
{
int val = boost::any_cast<int>(a);
std::cout<<val<<std::endl;
}
catch(boost::bad_any_cast& b)
{
std::cout<<"error!"<<std::endl;
}
}
2.
#include <iostream>
#include <string>
#include <utility>
#include <vector>
#include <boost/any.hpp>
class A
{
public:
void some_function() {std::cout<<"A::some_function()"<<std::endl;}
};
class B
{
public:
void some_function() {std::cout<<"B::some_function()"<<std::endl;}
};
class C
{
public:
void some_function() {std::cout<<"C::some_function()"<<std::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();
}
else
{
try
{
std::cout<<boost::any_cast<std::string>(a)<<std::endl;
}
catch(boost::bad_any_cast& b)
{
std::cout<<"Oops!"<<std::endl;
}
}
}
int main()
{
std::vector<boost::any> store_anything;
store_anything.push_back(A());
store_anything.push_back(B());
store_anything.push_back(C());
store_anything.push_back(std::string("love"));
store_anything.push_back(3);
store_anything.push_back(std::make_pair(true, 7.92));
std::for_each(store_anything.begin(), store_anything.end(), print_any);
}
3.