multiset初始化问题（静态函数作为模板参数）

1.先贴下出错代码

 class Basket {
public:
    void add_item(const std::shared_ptr<Quote> &sale);
    double total_receipt(std::ostream&) const;

private:
    static bool compare(const std::shared_ptr<Quote>& lhs,
                        const std::shared_ptr<Quote>& rhs)
    {return lhs->isbn() < rhs->isbn();}
    std::multiset<std::shared_ptr<Quote>,

                  decltype(compare)*> items (compare); //直接初始化出错
    decltype(compare) *p = compare;//这里没有问题
};

error 提示：
error: ‘compare’ is not a type
decltype(compare)*> items (compare);

2.修改后的代码

 class Basket {
public:
    void add_item(const std::shared_ptr<Quote> &sale);
    double total_receipt(std::ostream&) const;

private:
    static bool compare(const std::shared_ptr<Quote>& lhs,
                        const std::shared_ptr<Quote>& rhs)
    {return lhs->isbn() < rhs->isbn();}
    std::multiset<std::shared_ptr<Quote>,

                  decltype(compare)*> items {compare}; // 列表初始化没有问题
    decltype(compare) *p = compare;
};

3.在其他地方做得测试

 using namespace std;

bool Less(const shared_ptr<Quote> &lhs, const shared_ptr<Quote> &rhs)
{
    lhs->isbn() < rhs->isbn();
}

int main()
{

    multiset<shared_ptr<Quote>, decltype(Less)*> items{Less};// items(Less) 和 items{Less}都可以通过编译
}

请问类的静态函数作为multiset的模板参数和初始换参数时有什么限制么？

http://www.cnblogs.com/tangzhenqiang/p/4332801.html

可以参考一下http://www.cnblogs.com/tangzhenqiang/p/4332801.html

感谢大家的回复，我已经找到答案了，

The idea is to flat out reject any syntax that could be interpreted as a function declaration. For example,
std::vector ns();
is a function declaration. These aren't:
std::vector ns{};
std::vector ns = std::vector();
For consistency, any member declaration with this form
T t(args...);
is disallowed, which avoids a repeat of the most vexing parse fiasco.

我的代码里
std::multisetstd::shared_ptr<Quote, decltype(compare)*> items (compare);
这个定义有可能被解释称函数了，但是compare又不是一个类型
所以error提示
error: ‘compare’ is not a type