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PONamespaces and includes generate link error
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copied!<p>I was playing around with namespaces when I encountered a lnk2005 error. I can't figure out how to get around the error. Here's the error:</p> <pre><code>1>Source.obj : error LNK2005: "int Chart::Bars::d" (?d@Bars@Chart@@3HA) already defined in Chart.obj 1>Source.obj : error LNK2005: "class foo Chart::l" (?l@Chart@@3Vfoo@@A) already defined in Chart.obj 1>Source.obj : error LNK2005: "int Chart::t" (?t@Chart@@3HA) already defined in Chart.obj 1>C:\Users\bnm\dev\examples\play\nmspca\Debug\nmspca.exe : fatal error LNK1169: one or more multiply defined symbols found 1> 1>Build FAILED. 1> 1>Time Elapsed 00:00:00.49 ========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ========== </code></pre> <p>Here's the code...</p> <p>Chart.h</p> <pre><code>#pragma once #include "foo.h" namespace Chart { int t; foo l; namespace Bars { int d; } } </code></pre> <p>Foo.h</p> <pre><code>#pragma once class foo { public: int ss; char* h; }; </code></pre> <p>Chart.cpp</p> <pre><code>#include "Chart.h" using namespace Chart; int main () { l.h = "g"; } </code></pre> <p>Source.cpp</p> <pre><code>#include "Chart.h" using namespace Chart; int test() { l.ss = 0; return l.ss; } </code></pre> <p>When the #include "Chart.h" from Source.cpp is removed the problems goes away. However, Source.cpp needs #include "Chart.h" for the namespace definition.</p> <p>What's the correct way to express that "namespace Chart" is needed in both Chart.cpp and Source.cpp so that everything compiles?</p>

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