operator==,!=(std::experimental::function)

template< class R, class... ArgTypes > bool operator==( const std::experimental::function<R(ArgTypes...)>& f, std::nullptr_t ) noexcept;	(1)	(库基础 TS)
template< class R, class... ArgTypes > bool operator==( std::nullptr_t, const std::experimental::function<R(ArgTypes...)>& f ) noexcept;	(2)	(库基础 TS)
template< class R, class... ArgTypes > bool operator!=( const std::experimental::function<R(ArgTypes...)>& f, std::nullptr_t ) noexcept;	(3)	(库基础 TS)
template< class R, class... ArgTypes > bool operator!=( std::nullptr_t, const std::experimental::function<R(ArgTypes...)>& f ) noexcept;	(4)	(库基础 TS)

比较 std::experimental::function 和空指针。空 function （即无可调用目标的 function ）与之比较相等，非空 function 比较不相等。

f - 要比较的 std::experimental::function

1-2) !f

3-4) (bool) f

比较 std::function 和 nullptr
(函数模板)

experimental::optional
experimental::any
experimental::basic_string_view
experimental::sample
experimental::shared_ptr
experimental::weak_ptr
experimental::apply
experimental::invocation_type experimental::raw_invocation_type
experimental::search
experimental::default_searcher experimental::make_default_searcher
experimental::boyer_moore_searcher experimental::make_boyer_moore_searcher
experimental::boyer_moore_horspool_searcher experimental::make_boyer_moore_horspool_searcher
类型擦除及多态分配器
类型特性的变量模板

polymorphic_allocator
使用 polymorphic_allocator 的容器的便利别名
内存资源类
memory_resource
synchronized_pool_resource
unsynchronized_pool_resource
monotonic_buffer_resource
resource_adaptor
全局内存资源
new_delete_resource
null_memory_resource
get_default_resource
set_default_resource
既存类的类型擦除分配器支持
function
packaged_task
promise