"typename Enable = void"是什么意思? [英] What does 'typename Enable = void' mean?

问题描述

我发现 typename Enable = void 在但是，我找不到在Enable .h"rel =" noreferrer>头文件，这让我感到困惑. typename Enable = void 在模板中是什么意思?

However, I cannot find the Enable is used in this header file, which confuse me. What does typename Enable = void mean in template?

推荐答案

它允许SFINAE具有模板专业化功能，例如

It is to allow SFINAE with template specialization, as something like

template<typename T>
struct RefTypeTraits<T, std::enable_if_t<some_condition<T>::value>> {
    // ... specialization for T which respects condition
};

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