April 2018
Intermediate to advanced
303 pages
4h 54m
Chinese
Content preview from Effective Modern C++（中文版）
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184
｜
第
5
章
C++14
，上述代码仍然成立，不过我们可以利用别名模板来去掉
std::enable_if
和
std::decay
累赘的“
typename
”和“
::type
”部分，从而产生下面这段更加养眼的代码：
class Person {
// C++14
public:
template<
typename T,
typename = std::enable_if_t<
//
这里代码量更少
!std::is_base_of<Person,
std::decay_t<T>
//
还有这里
>::value
>
//
还有这里
>
explicit Person(T&& n);
…
};
好吧，我承认我在说谎。我们仍然不能说已经完工，但我们业已接近，接近得不能再
接近了。我诚实着呢。
我们已经看到如何运用
std::enable_if
来为那些本来就想使用
Person
类的复制和移
动构造函数的型别选择性地禁用
Person
类中接受万能引用的构造函数，但我们还没有
看到如何运用这一技术来区分实参是整型还是非整型。而后者，毕竟才是我们最原始
的目标。构造函数的多义词问题，一路上都在牵扯着我们注意力。
我们需要做的一切（这一回真的是所有工作了）就是：①为
Person
类添加一个处理
整型实参的构造函数重载版本；②进一步限制模板构造函数，在接受整型实参时禁用 ...
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