问题描述
我正在尝试编写一个可以打印堆栈和队列的函数,我的代码如下
I am trying to write a function that can print both stack and queue, my code is as following
但是这里不起作用,错误信息是:
我知道这是有问题的,并且知道 C++ 是静态类型的并且没有太多的运行时支持.但我想知道这不起作用的具体原因,以及如何处理.
I know it's problematic, and know C++ is statically typed and without too much Runtime support. but I am wondering the specific reason why this doesn't work, and how to deal with it.
P.S.:判断容器类型的实际含义是:你可以简单地通过传递队列容器而不是堆栈来将DFS函数更改为BFS.因此,BFS 和 DFS 可以共享大部分代码.
P.S.: The actual meaning of judge the typing of a container is that: You can simply change a DFS function into BFS by passing a queue container instead of a stack. So, BFS and DFS can share most of the code.
P.P.S:我在 C++ 11 环境中,但也欢迎对旧版或更新版标准的回答.
P.P.S: I am in C++ 11 environment, but answers for older or later standard are also welcomed.
推荐答案
if
-else
语句的两个分支都必须是可编译的,而在您的情况下则不然.基于部分专业化的许多可能的解决方案之一,即使在 C++98 中也应该工作:
Both branches of if
-else
statement must be compilable, which are not in your case. One of many possible solutions that is based on partial specialization and should work even in C++98:
<小时>
带有 if constexpr
的 C++17 解决方案:
A C++17 solution with if constexpr
:
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