问题
当调用Java方法(或内联函数)时,如果参数和参数都是基本类型,则不会使用扩展转换来定位适当的重载方法/构造函数。
示例
`
user=> (Integer. (byte 0))
java.lang.IllegalArgumentException: 没有找到与类java.lang.Integer匹配的构造函数 (NO_SOURCE_FILE:0)
上述原因是因为没有Integer(byte)构造函数,尽管它应该与Integer(int)匹配。
user=> (bit-shift-left (byte 1) 1)
Reflection warning, NO_SOURCE_PATH:3 - call to shiftLeft can't be resolved.
2`
In the above, a call is made via reflection to Numbers.shiftLeft(Object, Object) and its associated auto-boxing, instead of directly to the perfectly adequate Numbers.shiftLeft(long, int).
Workarounds:
Explicitly casting to the formal type.
Ancillary benefits of fixing:
It would also reduce the amount of method overloading, e.g., RT.intCast(char), intCast(byte), intCast(short), could all be removed, since such calls would pass to RT.intCast(int).