boost::any

My first attempt at using boost::any.

Adapted this code from here:

	#include <list>
	#include <boost/any.hpp>
	#include <iostream>
	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;
	}
	void print_any(boost::any const &operand)
	{
	if (is_empty(operand))
	{
	std::cout << "(empty)";
	}
	else if (is_int(operand))
	{
	std::cout << boost::any_cast<int>(operand);
	}
	else if (is_char_ptr(operand))
	{
	std::cout << boost::any_cast<char const*>(operand);
	}
	else if (is_string(operand))
	{
	std::cout << boost::any_cast<std::string>(operand);
	}
	}
	int main()
	{
	boost::any object = "there";
	many random_objects;
	append_int(random_objects, 1);
	append_char_ptr(random_objects, "hello");
	append_nothing(random_objects);
	append_any(random_objects, object);
	append_string(random_objects, "world");
	append_int(random_objects, 6);
	count_all(random_objects, std::cout);
	for (auto const i: random_objects)
	{
	print_any(i);
	std::cout << " ";
	}
	std::cout << std::endl;
	return 0;
	}

view raw any.cpp hosted with ❤ by GitHub

Here's the sample output:

nonbonding@castor-ub:~/dnonbonding/tmp/any$ g++ -std=c++11 -I/home/nonbonding/dnonbonding/bin/boost_1_60_0 c.cpp 

nonbonding@castor-ub:~/dnonbonding/tmp/any$ ./a.out 

#empty == 1

#int == 2

#const char * == 2

#string == 1

1 hello (empty) there world 6 

nonbonding@castor-ub:~/dnonbonding/tmp/any$