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#include <iostream>
#include <list>
#include <boost/any.hpp>
using boost::any_cast;
typedef std::list<boost::any> many;
void append_int(many & values, int value)
{
boost::any to_append = value;
values.push_back(to_append);
}
void append_string(many & values, const std::string & value)
{
values.push_back(value);
}
void append_char_ptr(many & values, const char * value)
{
values.push_back(value);
}
void append_any(many & values, const boost::any & value)
{
values.push_back(value);
}
void append_nothing(many & values)
{
values.push_back(boost::any());
}
bool is_empty(const boost::any & operand)
{
return operand.empty();
}
bool is_int(const boost::any & operand)
{
return operand.type() == typeid(int);
}
bool is_char_ptr(const boost::any & operand)
{
try
{
any_cast<const char *>(operand);
return true;
}
catch(const boost::bad_any_cast &)
{
return false;
}
}
bool is_string(const boost::any & operand)
{
return any_cast<std::string>(&operand);
}
void count_all(many & values, std::ostream & out)
{
out << "#empty == "
<< std::count_if(values.begin(), values.end(), is_empty) << std::endl;
out << "#int == "
<< std::count_if(values.begin(), values.end(), is_int) << std::endl;
out << "#const char * == "
<< std::count_if(values.begin(), values.end(), is_char_ptr) << std::endl;
out << "#string == "
<< std::count_if(values.begin(), values.end(), is_string) << std::endl;
}
int main(int, char*[]) {
many values;
append_int(values, 10);
append_int(values, 100);
append_string(values, "Hello!");
append_char_ptr(values, "World!");
append_nothing(values);
append_nothing(values);
count_all(values, std::cout);
return 0;
}
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