宣言中可能的大部分关键词

Question

纯粹出于好奇,我一直想知道有多少关键字可以适用于声明.假设模板不计(因为无穷大),我能想到的最长的是:

extern const unsigned long int i;

我也试图在那里适应新的.

我看了一堆,但没看到任何关于它.纯娱乐!

编辑 - 由于这个问题过于宽泛,你怎么能只为每个不同的关键字输入一次关键字.没有例外.当然,长期是一个完全合法的类型,我只想知道可以一起使用多少不同的类型.因此,在一个声明中可以容纳多少个关键字.可以是函数,成员函数或变量.

Answer 1

你说声明.这是一个函数声明,其中包含十个乱七八糟的命令:

int inline long constexpr volatile static unsigned const long foo() noexcept;

你可以用成员函数做十二个:

virtual int inline long constexpr volatile unsigned const long foo() const noexcept = delete;

我不知道你会怎么做,但我相信这是一个变量声明的有效二十,不包括初始化的可能性(虽然不包括,但包括decltype是有问题的):

alignas(sizeof(decltype(typeid(const volatile unsigned long long int)))) static thread_local decltype(typeid(const volatile unsigned long long int).name()) foo{};

当存在无限重复的可能性时,很难知道该避开什么.例如,我的变量声明没有强制转换,这就是为什么我说允许decltype是有问题的:

int i;
decltype(const_cast<const int &>(const_cast<int &>(const_cast<const int &>(i)))) foo{i};

Answer 2

这是一个几乎无限的:

thread_local constexpr static const unsigned long long*
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