Find matching lines in file pairs

miska_merger.cpp

#include <map>
#include <array>
#include <fstream>
#include <algorithm>

using namespace std;

typedef array<char, 32> buf_t;
typedef map<buf_t, buf_t> cmap_t;

struct cloud : cmap_t
{
	cloud(const string& name)
	{
		buf_t buf1, buf2;
		ifstream f1(name + ".txt"), f2(name + ".col");

		while (buf1.assign(0), buf2.assign(0),
			f1.getline(buf1.data(), buf1.size()) &&
			f2.getline(buf2.data(), buf2.size()))
			insert(value_type(buf1, buf2));
	}

	cloud(const cmap_t& m1, const cmap_t& m2)
	{
		set_intersection(
			m1.cbegin(), m1.cend(),
			m2.cbegin(), m2.cend(),
			inserter<cloud>(*this, begin()),
			[](const value_type& p1, const value_type& p2) { return p1.first < p2.first; });
	}

	void save(const string& name)
	{
		ofstream f1(name + ".txt"), f2(name + ".col");

		for (auto p : *this)
		{
			f1 << p.first.data() << endl;
			f2 << p.second.data() << endl;
		}
	}
};

int main()
{
	const string n1("rgb"), n2("phong"), pref("out\\miska_");

	for (string id = "_000"; id.back() != '4'; id.back()++)
	{
		const string name1(n1 + id), name2(n2 + id);
		const cloud c1(name1), c2(name2);
		cloud(c1, c2).save(pref + name1);
		cloud(c2, c1).save(pref + name2);
	}

	return 0;
}