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PO<functional> (nested bind) problems with MSVC 2010
 

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  1. PO<functional> (nested bind) problems with MSVC 2010
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    <p>I have the following code (I'm sorry for the lengthiness):</p> <pre><code>double primeValue( const func1D &amp;func, const double lowerBound, const double upperBound, const double pole ) { // check bounds if( lowerBound &gt;= upperBound ) throw runtime_error( "lowerBound must be smaller than upperBound!" ); // C++0x way of writing: fullFunc(x) = func(x)/(x-a) func1D fullFunc = bind( divides&lt;double&gt;(), // division of bind(func, _1), // f(x), with _1 = x bind(minus&lt;double&gt;(), _1, pole) ); // by x-a, with _1 = x // pole not in domain if( pole&lt;lowerBound || pole&gt;upperBound) { cout &lt;&lt; "Case 1" &lt;&lt; endl; return integrateSimpson( fullFunc, 1000, lowerBound, upperBound ); } // pole closer to upper bound else if( upperBound-pole &lt; pole-lowerBound ) { cout &lt;&lt; "Case 2" &lt;&lt; endl; // C++0x way of writing g(x) := [f(x)-f(2a-x)]/(x-a) func1D specialFirstFunc = bind( std::divides&lt;double&gt;(), // division of bind(minus&lt;double&gt;(), // numerator: bind(func, _1), // f(x) minus bind(func, bind(minus&lt;double&gt;(), 2.*pole, _1))), //f(2a-x) bind(minus&lt;double&gt;(), _1, pole) ); // denominator: x-a const double trickyPart = integrateSimpson( specialFirstFunc, 1000, pole+.000001, upperBound ); const double normalPart = integrateSimpson( fullFunc, 1000, lowerBound, 2.*pole-upperBound ); cout &lt;&lt; "Tricky part: " &lt;&lt; trickyPart &lt;&lt; endl; cout &lt;&lt; "Normal part: " &lt;&lt; normalPart &lt;&lt; endl; return trickyPart + normalPart; } else // pole closer to lower bound { cout &lt;&lt; "Case 3" &lt;&lt; endl; // C++0x way of writing g(x) := [f(x)-f(2a-x)]/(x-a) func1D specialFirstFunc = bind( std::divides&lt;double&gt;(), // division of bind(minus&lt;double&gt;(), // numerator: bind(func, _1), // f(x) minus bind(func, bind(minus&lt;double&gt;(), 2.*pole, _1))), //f(2a-x) bind(minus&lt;double&gt;(), _1, pole) ); // denominator: x-a const double trickyPart = integrateSimpson( specialFirstFunc, 1000, lowerBound, pole-.00001 ); const double normalPart = integrateSimpson( fullFunc, 1000, 2.*pole-lowerBound, upperBound ); cout &lt;&lt; "Tricky part: " &lt;&lt; trickyPart &lt;&lt; endl; cout &lt;&lt; "Normal part: " &lt;&lt; normalPart &lt;&lt; endl; return trickyPart + normalPart; } } </code></pre> <p>It integrates functions over the real axis that contain a singularity (pole) using the principal values concept from the math domain of Complex Analysis. The <code>bind</code> and <code>function</code> parts modify the original function f(x) to </p> <blockquote> <p>(f(x)-f(2*pole-x))/(x-a)</p> </blockquote> <p>It even gives he correct result for my simple test case function. Additional details I can provide if requested:</p> <pre><code>typedef std::function&lt;double (double)&gt; func1D; double integrateSimpson( func1D, const size_t nSteps, const double lowerBound, const double upperBound); </code></pre> <p>The latter integrates using the simple Simpson integration rule. Code can be provided, but isn't very relevant to the problem at hand.</p> <p>This compiles fine with GCC 4.4+ (tested with 4.4.5 and 4.5.2 prerelease, CFLAGS="-O2 -std=c++0x -pedantic -Wall -Wextra"), but produces internal header errors (C2664) on MSVC 2010. (I can provide error output if needed, there are no references at all to my code (!)).</p> <p>Have I found a bug in MSVC?</p> <p>Thanks!</p>
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    1. CO"Have I found a bug in MSVC?" - I wouldn't be surprised if you did. :)
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    2. COThis may be related: http://stackoverflow.com/questions/2425277/visual-studio-2010-and-stdfunction But I don't understand what the accepted answer suggest to do...
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