相关疑难解决方法(0)

我发现使用C++ STL方法进行简单的集合操作非常笨重.例如,要找到两组之间的差异:

std::set<int> newUserIds;
set_difference(currentUserIds.begin(), currentUserIds.end(), mPreviousUserIds.begin(), mPreviousUserIds.end(), std::inserter(newUserIds, newUserIds.end()));
std::set<int> missingUserIds;
set_difference(mPreviousUserIds.begin(), mPreviousUserIds.end(), currentUserIds.begin(), currentUserIds.end(), std::inserter(missingUserIds, missingUserIds.end()));
mPreviousUserIds = currentUserIds;

boost是否提供了一组替代类,可以将上面的示例缩小为:

set_type<int> newUserIds = currentUserIds.difference(mPreviousUserIds);
set_type<int> missingUserIds = mPreviousUserIds.difference(currentUserIds);

(类似于Qt中的QSet,它operator-以这种方式覆盖.)

我希望能够写出像a = bc这样的陈述; 其中b和c是std :: vector,a是它们的标量点积(double).为此,我应该将点积运算与'.'联系起来.符号.这可能吗？