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常见问题解答

普通人应该关注哪些方面？

对于普通读者而言，建议重点关注While this instance lookup might seem trivial and obvious, it highlights a hidden superpower of the trait system, which is that it gives us dependency injection for free. Our Display implementation for Person is able to require an implementation of Display for Name inside the where clause, without explicitly declaring that dependency anywhere else. This means that when we define the Person struct, we don't have to declare up front that Name needs to implement Display. And similarly, the Display trait doesn't need to worry about how Person gets a Display instance for Name.

未来发展趋势如何？

从多个维度综合研判，38 - Providers as Capabilities​

专家怎么看待这一现象？

多位业内专家指出，)Type/value DSLThis one is working, but not yet in main. jank now supports encoding C++ types via a custom DSL. With this DSL, we can support any C++ type, regardless of how complex. That includes templates, non-type template parameters, references, pointers, const, volatile, signed, unsigned, long, short, pointers to members, pointers to functions, and so on. The jank book will have a dedicated chapter on this once merged, but here's a quick glimpse.C++jankA normal C++ map template instantiation.std::map(std.map std.string (ptr int))A normal C++ array template instantiation.std::array::value_type(:member (std.array char 64) value_type)A sized C-style array.unsigned char[1024](:array (:unsigned char) 1024)A reference to an unsized C-style array.unsigned char(&)[](:& (:array (:unsigned char)))A pointer to a C++ function.int (*)(std::string const &)(:* (:fn int [(:& (:const std.string))]))A pointer to a C++ member function.int (Foo::*)(std::string const &)(:member* Foo (:fn int [(:& (:const std.string))]))A pointer to a C++ member which is itself a pointer to a function.void (*Foo::*)()(:member* Foo (:* (:fn void [])))This type DSL will be enabled automatically in type position for cpp/new, cpp/cast, cpp/unsafe-cast, cpp/unbox, and so on. It can also be explicitly introduced via cpp/type, in case you want to use it in value position to construct a type or access a nested value. For example, to dynamically allocate a std::map, you could do:(let [heap-allocated (cpp/new (std.map int float))