移植C++11 std::线程以提升::线程编译问题

Porting C++11 std::thread to boost::thread compile issues

本文关键字：线程 编译 问题 C++11 移植 std      更新时间：2023-10-16

我正在尝试使用 boost：：thread 将 C++11 std：：thread 代码移植到 VC9 （VS 2008）。下面的"等效"C++11 代码在 msvc12 上编译良好：

#include <iostream>
#include <thread>
#include <vector>
#include <algorithm>
#include <cassert>
void thFun(int i) 
{
    std::cout << "Hello from thread " << i << " !n";
}
int main()
{
    std::vector<std::thread> workers;
    for (int i = 0; i < 10; ++i)
    {
        auto th = std::thread(&thFun, i);
        workers.push_back(std::move(th));
        assert(!th.joinable());
    }
    std::cout << "Hello from main!n";
    std::for_each(workers.begin(), workers.end(), [](std::thread& th)
    {
        assert(th.joinable());
        th.join(); 
    });
    return 0;
}

我想使用 msvc9 编译器和 Boost 1.55 将代码移植到 C++03。如何解决以下编译错误：

#include <iostream>
#include <boost/thread.hpp>
#include <cassert>
#include <boost/foreach.hpp>
#include <boost/container/vector.hpp>
void thFun(int i) 
{
    std::cout << "Hello from thread " << i << " !n";
}
void foo(boost::thread& th)
{
    assert(th.joinable());
    th.join(); 
}
int main()
{    
    boost::container::vector<boost::thread> workers;
            for (int i = 0; i < 10; ++i)
    {
        BOOST_AUTO(th, boost::thread(&thFun, i));
        workers.push_back(boost::move(th));
        assert(!th.joinable());
    }
    std::cout << "Hello from main!n";
    BOOST_FOREACH(boost::thread& t, workers)
    {
        foo(t);
    }
    return 0;
}

编译错误为： 

d:program databoostboost_1_55_0boostpreprocessoriterationdetaillocal.hpp(37): error C2770: invalid explicit template argument(s) for '::boost::move_detail::enable_if_c<boost::enable_move_utility_emulation<T>::value&&!boost::move_detail::is_rv<T>::value,const T&>::type boost::forward(const ::boost::move_detail::identity<T>::type &)'
          d:program databoostboost_1_55_0boostmoveutility.hpp(78) : see declaration of 'boost::forward'
          d:program databoostboost_1_55_0boostcontainervector.hpp(1797) : see reference to function template instantiation 'void boost::container::allocator_traits<Alloc>::construct<T,T>(Alloc &,T *,const P0 &)' being compiled
          with
          [
              Alloc=std::allocator<boost::thread>,
              T=boost::thread,
              P0=boost::thread
          ]
          d:program databoostboost_1_55_0boostcontainervector.hpp(1791) : while compiling class template member function 'void boost::container::vector<T>::priv_push_back(const T &)'
          with
          [
              T=boost::thread
          ]
          d:workboostthreadscratchboostthreadscratchboostthreadscratch.cpp(19) : see reference to class template instantiation 'boost::container::vector<T>' being compiled
          with
          [
              T=boost::thread
          ]

把这个放在开头：

#define BOOST_THREAD_USES_MOVE

请参阅此处以供参考。它为boost::thread启用 Boost.Move （boost::move） 提供的仿真，默认情况下在 Boost.Thread 版本 2 中处于禁用状态（在您的情况下，MSVC9 可能会使用它）。

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