c++ - 在类定义中定义线程池的无法解释的语法错误

Question

我有以下类定义，但出于某种原因我无法在类定义本身内部定义线程池。它说: syntax error: identifier 'numberofpoolthreads' 我试着直接在类中定义它，但它给了我同样的语法错误，有人知道这是为什么吗？

#include "stdafx.h"
#include <boost/threadpool.hpp>
#include <boost/threadpool/pool.hpp>
#include <boost/threadpool/detail/pool_core.hpp>

typedef boost::threadpool::fifo_pool resolverpool;

class ResolverThreadPoolManager
{
public:
    ResolverThreadPoolManager::ResolverThreadPoolManager(int numberofpoolthreads);
    ResolverThreadPoolManager::~ResolverThreadPoolManager();

    resolverpool p(numberofpoolthreads);

private:
    int numberofpoolthreads;    
};

Answer 1

此行:resolverpool p(numberofpoolthreads); 在类定义中无效。您需要一个成员变量，然后在构造函数中对其进行初始化。例如:

class ResolverThreadPoolManager
{
public:
    explicit ResolverThreadPoolManager(int numberofpoolthreads);
    ...

private:
    const resolverpool p;
};

ResolverThreadPoolManager::ResolverThreadPoolManager(int numberofpoolthreads)
    : p(numberofpoolthreads)
    {}