:: std :: initializer_list与可变参数模板 [英] ::std::initializer_list vs variadic templates

问题描述

通过 :: std :: initializer_list 传递多个参数是否比可变函数模板方法具有任何优势?

Does passing multiple arguments via ::std::initializer_list offer any advantages over the variadic function template method?

在代码中:

template <typename T> void f(::std::initializer_list<T> const);

template <typename ...A> void f(A&& ...args);

请注意，也可以通过SFINAE或 static_assert()将类型 A ... 限制为单个类型.可以通过...来迭代参数.

Note that the types A... can be restricted to a single type as well, through SFINAE or static_assert(). The arguments can be iterated through ...

推荐答案

您可以以无法遍历参数包的方式遍历 std :: initializer_list (除非您拥有C ++)17，然后先将其折叠).因此，例如，您可以使用列表的 for 循环.对于参数包，只能通过递归专用定义来扩展它们.

You can iterate over an std::initializer_list in a way that you cannot over a parameter pack (unless you have C++17 and you fold it first). So for example you can have for loops with the lists. With parameter packs, you only option to expand them is via recursive specialised definitions.

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