‘typedef’ was ignored in this declaration

最新推荐文章于 2022-04-01 21:47:45 发布
原创 最新推荐文章于 2022-04-01 21:47:45 发布 · 1.1w 阅读 · 16 ·
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#typedef #ignored

本文深入探讨了C++中结构体定义与typedef的正确用法，解析了一个常见警告错误的原因，并提供了清晰的解决方案。通过理解结构体声明与typedef的关系，读者将学会如何避免在代码中出现类似的警告。 
typedef struct Elem{
    Elem(float N,int E)
    :e(E),
    n(N)
    {}
    float e;
    int n;
};

warning：‘typedef’ was ignored in this declaration
原因：结构体没有使用别名
解决：去掉typedef或在括号外加别名

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首先先展示一下问题是怎么样的： 出现了’typedef’ was ignored in this declaration的问题 下面提供解决方案及原因 原因：在于使用结构体的时候没有使用别名 解决方案：1. 去掉typedef 2.在结构体后面加上别名 解决后如下图 1. 2. 别名直接加上结构体名字即可啦！！ ...
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Question: Warning: 'typedef' was ignored in this declaration. Answers: Deletetypedef. It's the C way of declaring structs, C++ does it automatically for you. 转载于:https://www.cnblogs.com/zangkuo...
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[warning] 'typedef' was ignored in this declaration 这个警告表示在声明中忽略了typedef关键字。可能是因为typedef关键字被错误地放置在声明中的某个位置，或者声明本身已经包含了类型定义，因此不需要再使用...
D:\bicheng\zhzy\P3384.cpp:7:1: warning: 'typedef' was ignored in this declaration 7 | typedef class NodeOnTree; | ^~~~~~~ D:\bicheng\zhzy\P3384.cpp:8:1: warning: 'typedef' was ignored in this declaration 8 | typedef class SegmenTree; | ^~~~~~~ D:/mingw_msys2/ucrt64/bin/../lib/gcc/x86_64-w64-mingw32/15.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:\WINDOWS\TEMP\ccH0NvDG.o: in function `input()': D:/bicheng/zhzy/P3384.cpp:66:(.text+0x10a5): undefined reference to `init(int)' collect2.exe: error: ld returned 1 exit status
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警告'typedef' was ignored in this declaration通常发生在typedef声明没有正确定义类型时。 观察代码中的声明： 7 | typedef class NodeOnTree; 8 | typedef class SegmenTree; 这里试图用typedef为类起别名，...
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我们有一个枚举类型的定义，但是使用了typedef，而GCC给出了警告：'typedef' was ignored in this declaration。 原因分析：在C++中，使用`enum`定义枚举类型时，如果后面没有指定枚举类型的名字，那么它是一个未...
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你遇到的错误是因为 **Quartus Prime 默认使用的是传统 Verilog-2001 标准**，而我之前提供的代码使用了 **SystemVerilog 特性（如 `typedef enum`, `logic`, `always_ff` 等）**，这些在标准 Verilog 中是非法语法...
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