In jdk8源码的allocation.hpp gibt es
#define METASPACE_OBJ_TYPE_DECLARE(name) name ## Type,
#define METASPACE_OBJ_TYPE_NAME_CASE(name) case name ## Type: return #name;
enum Type {
// Types are MetaspaceObj::ClassType, MetaspaceObj::SymbolType, etc
METASPACE_OBJ_TYPES_DO(METASPACE_OBJ_TYPE_DECLARE)
_number_of_types
};Ich verstehe die grammatikalischen Regeln nicht in ## 在 define.
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#define是定义变量,2个##是连接运算符,可以查看##是连接运算符，参见 https://stackoverflow.com/que...