c++ - 什么是 "Unary Constructor"？

Question

这里是this link它说:

The static_cast keyword can be used for any normal conversion between types. Conversions that rely on static (compile-time) type information. This includes any casts between numeric types, casts of pointers and references up the hierarchy, conversions with unary constructor, conversions with conversion operator. For conversions between numeric types no runtime checks if data fits the new type is performed. Conversion with unary constructor would be performed even if it is declared as explicit.

还有 here :

To interoperate well with other CLS-compliant languages, you may wish to wrap each user-defined unary constructor for a given class with a corresponding convert-from operator.

“一元构造函数”是什么意思？

Answer 1

一元的意思是一个，所以他们说的是一个只有一个参数的构造函数。这种东西的标准名称是 conversion constructor .