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POError: declaration does not declare anything
 

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  1. POError: declaration does not declare anything
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    <p>This is a very amateur question with what I'm sure is going to be a very simple answer, but I cannot seem to figure out the problem. I have a header file with a corresponding .cpp file, but for some reason whenever I try to compile with g++, I keep getting the error:</p> <blockquote> <p>declaration does not declare anything</p> </blockquote> <p>I'm pretty sure the problem is that I'm not initializing the (only) variable in the file, but I'm not sure what to initialize it to. If anyone can help, I would greatly appreciate it! Here are my files:</p> <p>SymbolTableDictionary.h</p> <pre><code>#ifndef SymbolTable #define SymbolTable #include &lt;new&gt; #include &lt;iostream&gt; #include &lt;stdio.h&gt; #include &lt;stdlib.h&gt; #include &lt;string&gt; using namespace std; #pragma once struct Symbol { std::string Name; int Address; Symbol::Symbol() { } Symbol::Symbol(const string name, int address) { std::string sym(name); this-&gt;Name = sym; this-&gt;Address = address; } }; extern map&lt;std::string, Symbol&gt; SymbolTable; #endif </code></pre> <p>SymbolTableDictionary.cpp</p> <pre><code>#include &lt;new&gt; #include &lt;iostream&gt; #include &lt;stdio.h&gt; #include &lt;stdlib.h&gt; #include &lt;string&gt; #include &lt;map&gt; #include "SymbolTableDictionary.h" using namespace std; map&lt;std::string, Symbol&gt; SymbolTable; </code></pre> <p>Compilation errors:</p> <pre><code>In file included from SymbolTableDictionary.cpp:8:0: SymbolTableDictionary.h:18:5: error: extra qualification ‘Symbol::’ on member ‘Symbol’ [-fpermissive] SymbolTableDictionary.h:21:5: error: extra qualification ‘Symbol::’ on member ‘Symbol’ [-fpermissive] SymbolTableDictionary.h:29:8: error: declaration does not declare anything [-fpermissive] SymbolTableDictionary.cpp:12:1: error: declaration does not declare anything [-fpermissive] </code></pre>
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    1. USJonathan Leffler
    1. USJust Ask
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      1. POError: declaration does not declare anything
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    1. COYou should avoid `<cstdlib>` and `<cstdio>` in most C++ programs, let alone `<stdlib.h>` and `<stdio.h>`. Also, it is generally considered ill-advised to use `using namespace std;`, and it is considered ill-mannered to add it to a header. It would help if you identified the line where the compiler reports the problem.
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      1. USJonathan Leffler
    2. COI suggest using header guards with some variation on the theme of `#ifndef SYMBOLTABLEDICTIONARY_H_INCLUDED` (all caps, based on the name of the file, name unlikely to be used for other purposes). Another reasonable suggestion is to use a name based on the MD5 hash of the contents of some version of the file: `#ifndef H_779f06b8e4323b7991ddfd9078d79923` perhaps.
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      1. POError: declaration does not declare anything
      1. USJonathan Leffler
    3. COThe fact that the header guard and variable name were the same was what caused the problem. Can't believe I did not see that before. Thanks for everyone's help! Much appreciated!
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      1. USJust Ask
 

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