是否可以使用 Boost.Coroutine嵌套协程

Is it possible to nest coroutines using Boost.Coroutine?

本文关键字：嵌套 Coroutine Boost 可以使 是否      更新时间：2023-10-16

我想在已经在协程中调用协程。使用Boost.Coroutine可以吗？

是的，这很简单：

#include <iostream>
#include <boost/coroutine/coroutine.hpp>
typedef boost::coroutines::coroutine<int()> generator;
void bar(generator::caller_type& yield)
{
  for (std::size_t i = 100; i < 110; ++i)
    yield(i);
}
void foo(generator::caller_type& yield)
{
  for (std::size_t i = 0; i < 10; ++i)
  {
    generator nested_gen(bar);
    while (nested_gen)
    {
      std::cout << "foo: " << nested_gen.get() << std::endl;
      nested_gen();
    }
    yield(i);
  }
}
int main()
{
  generator gen(foo);
  while (gen)
  {
    std::cout << "main: " << gen.get() << std::endl;
    gen();
  }
  return 0;
};

编辑：提升时>= 1.56

#include <iostream>
#include <boost/coroutine/asymmetric_coroutine.hpp>
using generator = typename boost::coroutines::asymmetric_coroutine<std::size_t>::pull_type;
using yield_type = typename boost::coroutines::asymmetric_coroutine<std::size_t>::push_type;
void bar(yield_type& yield)
{
  for (std::size_t i = 100; i < 110; ++i)
    yield(i);
}
void foo(yield_type& yield)
{
  for (std::size_t i = 0; i < 10; ++i)
  {
    generator nested_gen{bar};
    while (nested_gen)
    {
      std::cout << "foo: " << nested_gen.get() << 'n';
      nested_gen();
    }
    yield(i);
  }
}
int main()
{
  generator gen{foo};
  while (gen)
  {
    std::cout << "main: " << gen.get() << 'n';
    gen();
  }
  return 0;
};
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