我试图在C ++项目中使用协同程序。但是，由于对callcc()的模糊使用，它无法编译。我已经尝试在coroutine构造函数中指定allocator，但这似乎并没有产生差异。
在将代码删除到最基本的要点之后，我最终用与boost文档中的fibbonacci示例非常类似的东西重现了这个问题。
#include <iostream>
#include <boost/coroutine2/all.hpp>
/*
c++ -std=c++11 -o corofib corofib.cpp
*/
typedef boost::coroutines2::coroutine<unsigned long> coro_t;
coro_t::pull_type generator(
[](coro_t::push_type& sink) {
unsigned long first = 1L;
unsigned long second = 1L;
unsigned long answer;
sink(first);
sink(second);
while(1) {
answer = first + second;
first = second;
second = answer;
sink(answer);
};
}
);
int main(int argc, char* argv[]) {
generator();
std::cout << generator.get() << std::endl;
generator();
std::cout << generator.get() << std::endl;
generator();
std::cout << generator.get() << std::endl;
generator();
std::cout << generator.get() << std::endl;
}
我正在使用：
这是我收到的错误消息。我已经删除了＆＃34;所需的＆＃34;通知试图缩短这篇文章：
lear@delegato:~/lamu$ c++ -std=c++14 -o corofib corofib.cpp
In file included from /usr/local/include/boost/coroutine2/detail/coroutine.hpp:48:0,
from /usr/local/include/boost/coroutine2/coroutine.hpp:15,
from /usr/local/include/boost/coroutine2/all.hpp:10,
from corofib.cpp:2:
/usr/local/include/boost/coroutine2/detail/pull_control_block_cc.ipp: In instantiation of ‘boost::coroutines2::detail::pull_coroutine<T>::control_block::control_block(boost::context::preallocated, StackAllocator, Fn&&) [with StackAllocator = boost::context::basic_fixedsize_stack<boost::context::stack_traits>; Fn = <lambda(boost::coroutines2::coroutine<long unsigned int>::push_type&)>; T = long unsigned int]’:
/usr/local/include/boost/coroutine2/detail/pull_control_block_cc.ipp:105:14: error: call of overloaded ‘callcc(const std::allocator_arg_t&, boost::context::preallocated&, boost::context::basic_fixedsize_stack<boost::context::stack_traits>&, boost::coroutines2::detail::pull_coroutine<T>::control_block::control_block(boost::context::preallocated, StackAllocator, Fn&&) [with StackAllocator = boost::context::basic_fixedsize_stack<boost::context::stack_traits>; Fn = <lambda(boost::coroutines2::coroutine<long unsigned int>::push_type&)>; T = long unsigned int]::<lambda(boost::context::continuation&&)>)’ is ambiguous
});
^
/usr/local/include/boost/coroutine2/detail/pull_control_block_cc.ipp:105:14: note: candidates are:
In file included from /usr/local/include/boost/coroutine2/detail/pull_control_block_cc.hpp:14:0,
from /usr/local/include/boost/coroutine2/detail/coroutine.hpp:37,
from /usr/local/include/boost/coroutine2/coroutine.hpp:15,
from /usr/local/include/boost/coroutine2/all.hpp:10,
from corofib.cpp:2:
/usr/local/include/boost/context/continuation.hpp:469:1: note: boost::context::continuation boost::context::callcc(std::allocator_arg_t, StackAlloc, Fn&&, Arg ...) [with StackAlloc = boost::context::preallocated; Fn = boost::context::basic_fixedsize_stack<boost::context::stack_traits>&; Arg = {boost::coroutines2::detail::pull_coroutine<T>::control_block::control_block(boost::context::preallocated, StackAllocator, Fn&&) [with StackAllocator = boost::context::basic_fixedsize_stack<boost::context::stack_traits>; Fn = <lambda(boost::coroutines2::coroutine<long unsigned int>::push_type&)>; T = long unsigned int]::<lambda(boost::context::continuation&&)>}]
callcc( std::allocator_arg_t, StackAlloc salloc, Fn && fn, Arg ... arg) {
^
/usr/local/include/boost/context/continuation.hpp:483:1: note: boost::context::continuation boost::context::callcc(std::allocator_arg_t, boost::context::preallocated, StackAlloc, Fn&&, Arg ...) [with StackAlloc = boost::context::basic_fixedsize_stack<boost::context::stack_traits>; Fn = boost::coroutines2::detail::pull_coroutine<T>::control_block::control_block(boost::context::preallocated, StackAllocator, Fn&&) [with StackAllocator = boost::context::basic_fixedsize_stack<boost::context::stack_traits>; Fn = <lambda(boost::coroutines2::coroutine<long unsigned int>::push_type&)>; T = long unsigned int]::<lambda(boost::context::continuation&&)>; Arg = {}]
callcc( std::allocator_arg_t, preallocated palloc, StackAlloc salloc, Fn && fn, Arg ... arg) {
^
/usr/local/include/boost/context/continuation.hpp:514:1: note: boost::context::continuation boost::context::callcc(std::allocator_arg_t, boost::context::preallocated, StackAlloc, Fn&&) [with StackAlloc = boost::context::basic_fixedsize_stack<boost::context::stack_traits>; Fn = boost::coroutines2::detail::pull_coroutine<T>::control_block::control_block(boost::context::preallocated, StackAllocator, Fn&&) [with StackAllocator = boost::context::basic_fixedsize_stack<boost::context::stack_traits>; Fn = <lambda(boost::coroutines2::coroutine<long unsigned int>::push_type&)>; T = long unsigned int]::<lambda(boost::context::continuation&&)>]
callcc( std::allocator_arg_t, preallocated palloc, StackAlloc salloc, Fn && fn) {
^
/usr/local/include/boost/context/continuation.hpp:457:1: note: boost::context::continuation boost::context::callcc(Fn&&, Arg ...) [with Fn = const std::allocator_arg_t&; Arg = {boost::context::preallocated, boost::context::basic_fixedsize_stack<boost::context::stack_traits>, boost::coroutines2::detail::pull_coroutine<T>::control_block::control_block(boost::context::preallocated, StackAllocator, Fn&&) [with StackAllocator = boost::context::basic_fixedsize_stack<boost::context::stack_traits>; Fn = <lambda(boost::coroutines2::coroutine<long unsigned int>::push_type&)>; T = long unsigned int]::<lambda(boost::context::continuation&&)>}; <template-parameter-1-3> = void]
callcc( Fn && fn, Arg ... arg) {
我认为代码基本上是合理的：我只需要以某种方式消除歧义。
我可以说一下这在python中有多容易，但它可能会引发笑声。