c++ - Boost 编译问题

Question

我对 boost 非常非常陌生。据我了解，boost::mutex 有两个成员 lock() 和 unlock()。但是，我收到以下关于它们后面的函数的错误消息。我在与源代码相同的文件夹中运行了“sudo apt-get install libboost-dev”命令。这也是我教授给学生的代码。我确定它应该正确编译。任何帮助都会很棒!

错误信息:

matrix.cc: In function ‘void p_scalarproduct_t(int*, int*, int*, int, int, boost::mutex*)’:

matrix.cc:75: error: ‘class boost::mutex’ has no member named ‘lock’

matrix.cc:77: error: ‘class boost::mutex’ has no member named ‘unlock’

matrix.cc: In function ‘int p_scalarproduct(int*, int*, int, int)’:

matrix.cc:91: error: ‘bind’ is not a member of ‘boost’

代码:

void p_scalarproduct_t(int* c, int* a, int* b, 
                       int s, int e, boost::mutex* lock)
{ 
    int tmp;

    tmp = 0;
    for (int k = s; k < e; k++)
        tmp += a[k] * b[k];

    lock->lock();
    *c = *c + tmp;
    lock->unlock();
}

Answer 1

要在 boost 中锁定一个锁，您需要将其传递给关联的 scoped_lock，在本例中为 boost::mutex::scoped_lock。因此，要锁定一把锁 l_，请执行以下操作:

boost::mutex::scoped_lock l(l_)