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    <p>Please use <a href="http://cppunit.sourceforge.net/doc/lastest/group___assertions.html#ga3" rel="nofollow"><code>CPPUNIT_ASSERT_EQUAL</code></a>, which takes an actual and expected value. This pretty much eliminates the need for formatting a string, as the actual and expected values will be printed in the failure message.</p> <p>You could also copy the implementation of this macro and the function it invokes and add additional macros for other types of comparisons. Another idea I tried out would be to use operator overloading to capture the value out of an expression. This (ab)uses operator overloading to capture the expression, but it seems perhaps a bit too hackish. I have included it to give you an idea of what is possible, but would not recommend its use:</p> <pre><code>#include &lt;iostream&gt; #include &lt;sstream&gt; class ExpressionPrinter { public: std::ostringstream result; template&lt;typename T&gt; ExpressionPrinter&amp; operator&lt;&lt;(const T&amp; other) { result &lt;&lt; other; return *this; } template&lt;typename T&gt; ExpressionPrinter&amp; operator&lt;(const T&amp; other) { result &lt;&lt; " &lt; "; result &lt;&lt; other; return *this; } template&lt;typename T&gt; ExpressionPrinter&amp; operator&lt;=(const T&amp; other) { result &lt;&lt; " &lt;= "; result &lt;&lt; other; return *this; } template&lt;typename T&gt; ExpressionPrinter&amp; operator&gt;(const T&amp; other) { result &lt;&lt; " &gt; "; result &lt;&lt; other; return *this; } template&lt;typename T&gt; ExpressionPrinter&amp; operator&gt;=(const T&amp; other) { result &lt;&lt; " &gt;= "; result &lt;&lt; other; return *this; } template&lt;typename T&gt; ExpressionPrinter&amp; operator==(const T&amp; other) { result &lt;&lt; " == "; result &lt;&lt; other; return *this; } template&lt;typename T&gt; ExpressionPrinter&amp; operator!=(const T&amp; other) { result &lt;&lt; " != "; result &lt;&lt; other; return *this; } }; #define ASSERT(X) doAssert((X), (ExpressionPrinter() &lt;&lt; X)); void doAssert(bool result, const ExpressionPrinter&amp; message) { std::cout &lt;&lt; "Result: " &lt;&lt; result &lt;&lt; ", Expression: " &lt;&lt; message.result.str() &lt;&lt; std::endl; } int main() { int i = 1, j = 2; ASSERT(i &lt; j); return 0; } </code></pre>
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    1. COI do like this macro, however it doesn't allow for assertions other than equality. How do you use greater than or less than?
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    2. COI have added a few additional comments.
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