06-01-frame-hcat.cpp

#include <iostream>
#include <string>
#include <vector>

using namespace std;

void out(const std::vector<std::string>& v)
{
    for(std::vector<std::string>::const_iterator iter = v.begin();
        iter != v.end(); ++iter)
        cout << *iter << endl;
}

std::string::size_type width(const std::vector<std::string>& v)
{
    string::size_type maxlen = 0;
    for(std::vector<std::string>::const_iterator iter = v.begin();
        iter != v.end(); ++iter)
        maxlen = max(maxlen, iter->size());
    return maxlen;
}

std::vector<std::string> frame(const std::vector<std::string>& v)
{
    vector<string> ret;
    string::size_type maxlen = width(v);
    string border(maxlen + 4, '*');
    ret.push_back(border);
    for(std::vector<std::string>::const_iterator iter = v.begin();
        iter != v.end(); ++iter) {
        ret.push_back("* " + (*iter) + string(maxlen - iter->size(),' ') + " *");
    }
    ret.push_back(border);
    return ret;
}

std::vector<std::string> vcat(const std::vector<std::string>& top,
    const std::vector<std::string>& bottom)
{
    vector<string> ret = top;
    ret.insert(ret.end(),bottom.begin(),bottom.end());
    return ret;
}

std::vector<std::string> hcat(const std::vector<std::string>& left,
    const std::vector<std::string>& right)
{
    vector<string> ret;
    string::size_type width1 = width(left) + 1;
    vector<string>::const_iterator 
        i = left.begin(),
        j = right.begin();

    while(i != left.end() || j != right.end())
    {
        string s;
        if(i != left.end())
            s = *i++;
        s += string(width1 - s.size(),' ');
        if(j != right.end())
            s += *j++;
        ret.push_back(s);
    }

    return ret;
}

int main()
{
    // read data
    vector<string> v,f;
    string line;
    while(getline(cin, line))
        v.push_back(line);
    f = frame(v);
    out(vcat(v,f));
    out(hcat(v,f));
}