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POISO C++ forbids declaration of ‘tuple’ with no type
 

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  1. POISO C++ forbids declaration of ‘tuple’ with no type
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    <p>When trying to compile a simple class (<code>g++ myclass.cpp</code>), I get the following error:</p> <pre><code>ISO C++ forbids declaration of ‘tuple’ with no type </code></pre> <p>I searched for this problem, and in most cases people seemed to forget <code>std::</code> or including <code>&lt;tuple&gt;</code> in the header. But I have both. Here is my code:</p> <p><strong>myclass.h</strong></p> <pre><code>#ifndef MYCLASS #define MYCLASS #include &lt;iostream&gt; #include &lt;tuple&gt; class MyClass { std::tuple&lt;bool, int, int&gt; my_method(); }; #endif </code></pre> <p><strong>myclass.cpp</strong></p> <pre><code>#include "myclass.h" using namespace std; tuple&lt;bool, int, int&gt; MyClass::my_method() { return make_tuple(true, 1, 1); } </code></pre> <p>If I do the same using <code>pair</code> instead, leaving out the second <code>int</code> and including <code>&lt;set&gt;</code>, it works.</p> <p>What am I missing?</p> <p><strong>EDIT:</strong></p> <p>Here is the full output:</p> <pre><code>$ g++ myclass.cpp -o prog In file included from myclass.cpp:1: myclass.h:7: error: ISO C++ forbids declaration of ‘tuple’ with no type myclass.h:7: error: invalid use of ‘::’ myclass.h:7: error: expected ‘;’ before ‘&lt;’ token myclass.cpp:5: error: expected constructor, destructor, or type conversion before ‘&lt;’ token </code></pre> <p></p> <pre><code>$ g++ --version i686-apple-darwin11-llvm-g++-4.2 (GCC) 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2336.11.00) </code></pre>
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    1. CODid you specify `-std=c++11` when compiling the code?
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      1. USDietmar Kühl
    2. CO`using namespace std;` - What a blasphemy!
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      1. USZaur Nasibov
    3. COCan't reproduce this error. Are you sure that you used exactly this code? You should mark the exact line g++ reported.
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