Necessity of writing print functions for containers?

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刺人心 2021-01-26 13:40

I use about 6 different C++ containers. I started writing print functions to output the container contents. Is this necessary? I would think this is part of the C++ library?<

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悲&欢浪女 (楼主)

2021-01-26 14:31

What about:

#include 
#include 
#include 

template 
    std::ostream& operator<<(std::ostream& os, const std::pair& p)
{
    return os << "[" << p.first << ", " << p.second << "]";
}

template 
    std::ostream& operator<<(std::ostream& os, const Container& c)
{
    std::copy(c.begin(), c.end(), 
        std::ostream_iterator(os, " "));
    return os;
}

You might also be charmed about Boost Spirit Karma:

#include 

using boost::spirit::karma::format;
using boost::spirit::karma::auto_;

int main()
{
     std::vector ints(1000);
     std::map pairs();

     // ...

     std::cout << format(auto_ % " ", ints) << std::endl;
     std::cout << format(('[' << auto_ << ',' << ']') % " ", pairs) << std::endl;
}

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