14.4.2.2 Better function member

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本文探讨了在给定参数类型的情况下如何评估两个函数成员的适用性。定义了一个函数成员相较于另一个更好的条件：对于每个参数，隐式转换不会更差；至少有一个参数的转换更好。

Given an argument list A with a set of argument types A1, A2, ?, AN and two
applicable function members MP
and MQ with parameter types P1, P2, ?, PN and Q1, Q2, ?, QN, MP is defined
to be a better function member
than MQ if
?for each argument, the implicit conversion from AX to PX is not worse
than the implicit conversion from
AX to QX, and
?for at least one argument, the conversion from AX to PX is better than
the conversion from AX to QX.
When performing this evaluation, if MP or MQ is applicable in its expanded
form, then PX or QX refers to a
parameter in the expanded form of the parameter list.