Threading block [3] -- lambda

第二课：Lambda expression

将前面的functor采用c++0x中的lambda实现如下：

void parallel_apply_foo(int a[], int n)
{
    parallel_for(blocked_range<size_t>(0, n),
             [=](const blocked_range<size_t>& r) {
                 for (size_t i = r.begin(); i != r.end(); ++i)
                      foo(a[i]);
             });
}


其中Lambda参数意义：
[], no variables defines, using one will result in error
[x, &y], x is captured by value, y is captured by reference
[&], any external variables is implicitly captured by reference if used
[=], any external variables is implicitly captured by value if used
[&, x], x is captured by value, all others by reference
[=, &z], z is captured by reference, all others by value