从整数创建宏参数

Question

TeX 模式对我来说仍然很模糊。这里有一个问题可以澄清这个问题：如果一个函数传递了一个整数，比如 m，作为参数 #1，那么如何从 #1 创建宏参数 ##m？

\documentclass{minimal}
\usepackage{expl3}

\ExplSyntaxOn

% Naive approach to create macro parameters:

\cs_set:Npn \__foo_code:n #1{(## #1)} % Wanted: concac ## and #1<-int, (an integer) to yiel
\cs_set:Npn \__bar_code:n #1{[## #1]} 
\cs_set:Npn \__baz:nn #1 #2
{
    \__foo_code:n{1}
    \__bar_code:n{2}
}


\begin{document}

\__baz:nn{x}{y} % Wanted: (x)[y]
% Getting: ! You can't use `macro parameter character #' in horizontal mode.


\ExplSyntaxOff

\end{document}

Answer 1

您几乎已经完成了，只需改变一个字母：

\documentclass{minimal}
\usepackage{expl3}

\ExplSyntaxOn

% Naive approach to create macro parameters:

\cs_set:Npn \__foo_code:n #1{(## #1)} % Wanted: concac ## and #1<-int, (an integer) to yiel
\cs_set:Npn \__bar_code:n #1{[## #1]} 
\cs_set:Npx \__baz:nn #1 #2
{
    \__foo_code:n{1}
    \__bar_code:n{2}
}


\begin{document}

\__baz:nn{x}{y} % Wanted: (x)[y]
% Getting: ! You can't use `macro parameter character #' in horizontal mode.


\ExplSyntaxOff

\end{document}