51 lines
1.5 KiB
C++
51 lines
1.5 KiB
C++
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// Copyright Nat Goodspeed 2013.
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#include <iostream>
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#include <iomanip>
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#include <vector>
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#include <string>
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#include <utility>
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#include <boost/coroutine2/all.hpp>
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struct FinalEOL{
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~FinalEOL(){
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std::cout << std::endl;
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}
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};
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int main(int argc,char* argv[]){
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using std::begin;
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using std::end;
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std::vector<std::string> words{
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"peas", "porridge", "hot", "peas",
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"porridge", "cold", "peas", "porridge",
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"in", "the", "pot", "nine",
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"days", "old" };
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int num=5,width=15;
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boost::coroutines2::coroutine<std::string>::push_type writer(
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[&](boost::coroutines2::coroutine<std::string>::pull_type& in){
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// finish the last line when we leave by whatever means
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FinalEOL eol;
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// pull values from upstream, lay them out 'num' to a line
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for (;;){
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for(int i=0;i<num;++i){
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// when we exhaust the input, stop
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if(!in) return;
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std::cout << std::setw(width) << in.get();
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// now that we've handled this item, advance to next
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in();
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}
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// after 'num' items, line break
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std::cout << std::endl;
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}
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});
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std::copy(begin(words),end(words),begin(writer));
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std::cout << "\nDone";
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return EXIT_SUCCESS;
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}
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