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// Copyright Keld Helsgaun 2000, Oliver Kowalke 2014.
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
#include <boost/coroutine/all.hpp>
#include <cstdlib>
#include <cstddef>
#include <iostream>
#include <vector>
#include <boost/bind.hpp>
#include <boost/foreach.hpp>
typedef boost::coroutines::symmetric_coroutine< void > coro_t;
class merger
{
private:
std::size_t max_;
std::vector< int > & to_;
void run_( coro_t::yield_type & yield)
{
while ( idx < from.size() )
{
if ( other->from[other->idx] < from[idx])
yield( other->coro);
to_.push_back(from[idx++]);
}
while ( to_.size() < max_)
to_.push_back( other->from[other->idx++]);
}
merger( merger const&);
merger & operator=( merger const&);
public:
std::vector< int > const& from;
std::size_t idx;
merger * other;
coro_t::call_type coro;
merger( std::vector< int > const& from_, std::vector< int > & to, std::size_t max) :
max_( max),
to_( to),
from( from_),
idx( 0),
other( 0),
coro( boost::bind( & merger::run_, this, _1) )
{}
void run()
{ coro(); }
};
std::vector< int > merge( std::vector< int > const& a, std::vector< int > const& b)
{
std::vector< int > c;
merger ma( a, c, a.size() + b. size() );
merger mb( b, c, a.size() + b. size() );
ma.other = & mb;
mb.other = & ma;
ma.run();
return c;
}
void print( std::string const& name, std::vector< int > const& v)
{
std::cout << name << " : ";
BOOST_FOREACH( int itm, v)
{ std::cout << itm << " "; }
std::cout << "\n";
}
int main( int argc, char * argv[])
{
std::vector< int > a;
a.push_back( 1);
a.push_back( 5);
a.push_back( 6);
a.push_back( 10);
print( "a", a);
std::vector< int > b;
b.push_back( 2);
b.push_back( 4);
b.push_back( 7);
b.push_back( 8);
b.push_back( 9);
b.push_back( 13);
print( "b", b);
std::vector< int > c = merge( a, b);
print( "c", c);
std::cout << "Done" << std::endl;
return EXIT_SUCCESS;
}
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