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POg++ compiler error: expected ‘,’ or ‘...’ before ‘>’ token only on Mac
 

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  1. POg++ compiler error: expected ‘,’ or ‘...’ before ‘>’ token only on Mac
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    <p>I've got a program that won't compile on a Mac (gcc 4.2.1, Apple Inc. build 5658) but seems to have no trouble on a Linux (gcc 4.7.2). I get the above error when I try to write a class with member functions that take STL vectors containing STL pair objects:</p> <p>test.h:</p> <pre><code>#ifndef TEST_H_ #define TEST_H_ #include &lt;vector&gt; #include &lt;utility&gt; #include &lt;string&gt; class testclass { public: void printcontent(const std::vector&lt;std::string&gt; &amp; = std::vector&lt;std::string&gt;()); void printother(const std::vector&lt;std::pair&lt;float,float&gt; &gt;&amp; = std::vector&lt;std::pair&lt;float,float&gt; &gt;()); }; #endif </code></pre> <p>test.cpp:</p> <pre><code>#include "test.h" #include &lt;iostream&gt; using namespace std; void testclass::printcontent(const vector&lt;string&gt; &amp;v) { if (v.empty()) cout &lt;&lt; "vector was empty!" &lt;&lt; endl; else for (unsigned i = 0; i &lt; v.size(); i++) cout &lt;&lt; v.at(i) &lt;&lt; endl; } void testclass::printother(const vector&lt;pair&lt;float,float&gt; &gt;&amp; v) { if (v.empty()) cout &lt;&lt; "vector was empty!" &lt;&lt; endl; else for (unsigned i = 0; i &lt; v.size(); i++) cout &lt;&lt; v.at(i).first &lt;&lt; ' ' &lt;&lt; v.at(i).second &lt;&lt; endl; } int main() { testclass tc; vector&lt;string&gt; v1; v1.push_back("a"); v1.push_back("b"); v1.push_back("c"); tc.printcontent(v1); tc.printcontent(); vector&lt;pair&lt;float,float&gt; &gt; v2; v2.push_back(pair&lt;float,float&gt;(1,2)); v2.push_back(pair&lt;float,float&gt;(3,4)); v2.push_back(pair&lt;float,float&gt;(5,6)); tc.printother(v2); tc.printother(); } </code></pre> <p>If the same function prototypes are not inside a class definition, everything compiles and runs fine.</p> <p>Am I making a stupid C++ error that my Linux compiler tolerates, or is this a Mac compiler problem?</p> <p>The full error message:</p> <pre><code>$ g++ -o test test.cpp In file included from test.cpp:1: test.h:12: error: expected ‘,’ or ‘...’ before ‘&gt;’ token test.h:12: error: wrong number of template arguments (1, should be 2) /usr/include/c++/4.2.1/bits/stl_pair.h:68: error: provided for ‘template&lt;class _T1, class _T2&gt; struct std::pair’ test.h:12: error: template argument 1 is invalid test.h:12: error: template argument 2 is invalid test.h:12: error: default argument missing for parameter 2 of ‘void testclass::printother(const std::vector&lt;std::pair&lt;float, float&gt;, std::allocator&lt;std::pair&lt;float, float&gt; &gt; &gt;&amp;, float)’ test.cpp:18: error: prototype for ‘void testclass::printother(const std::vector&lt;std::pair&lt;float, float&gt;, std::allocator&lt;std::pair&lt;float, float&gt; &gt; &gt;&amp;)’ does not match any in class ‘testclass’ test.h:12: error: candidate is: void testclass::printother(const std::vector&lt;std::pair&lt;float, float&gt;, std::allocator&lt;std::pair&lt;float, float&gt; &gt; &gt;&amp;, float) test.cpp: In function ‘int main()’: test.cpp:46: error: call of overloaded ‘printother(std::vector&lt;std::pair&lt;float, float&gt;, std::allocator&lt;std::pair&lt;float, float&gt; &gt; &gt;&amp;)’ is ambiguous test.h:12: note: candidates are: void testclass::printother(const std::vector&lt;std::pair&lt;float, float&gt;, std::allocator&lt;std::pair&lt;float, float&gt; &gt; &gt;&amp;, float) test.cpp:18: note: void testclass::printother(const std::vector&lt;std::pair&lt;float, float&gt;, std::allocator&lt;std::pair&lt;float, float&gt; &gt; &gt;&amp;) </code></pre> <p>An update... I've tested a similar example with a vector of vectors, and don't get the same error:</p> <p>test2.h:</p> <pre><code>#ifndef TEST2_H_ #define TEST2_H_ #include &lt;vector&gt; class testclass { public: void printother(const std::vector&lt;std::vector&lt;float&gt; &gt; &amp; = std::vector&lt;std::vector&lt;float&gt; &gt;()); }; #endif </code></pre> <p>test2.cpp:</p> <pre><code>#include "test2.h" #include &lt;iostream&gt; using namespace std; void testclass::printother(const vector&lt;vector&lt;float&gt; &gt;&amp; v) { if (v.empty()) cout &lt;&lt; "vector was empty!" &lt;&lt; endl; else for (unsigned i = 0; i &lt; v.size(); i++) for (unsigned j = 0; j &lt; v.at(i).size(); j++) if (j &lt; v.at(i).size() - 1) cout &lt;&lt; v.at(i).at(j) &lt;&lt; ' '; else cout &lt;&lt; v.at(i).at(j) &lt;&lt; endl; } int main() { testclass tc; vector&lt;vector&lt;float&gt; &gt; v2; v2.push_back(vector&lt;float&gt;()); v2.back().push_back(0); v2.back().push_back(1); v2.back().push_back(2); v2.push_back(vector&lt;float&gt;()); v2.back().push_back(3); v2.back().push_back(4); v2.back().push_back(5); tc.printother(v2); } </code></pre>
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    1. COWhat is the line number? Can you post the full error?
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    2. COAre you sure you didn't change anything? I'd expect the error to occur when using `>>` as opposed to `> >` for the ending angle brackets.
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    3. CObtw, you should get warnings as you add integer types to floats
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