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POSyntax for std::binary_function usage
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3143895
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3143957
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2
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CreationDate
2010-06-29T19:07:03.007
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2014-05-15T11:07:39.360
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2014-05-15T11:07:39.360
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Body
I'm a newbie at using the STL Algorithms and am currently stuck on a syntax error. My overall goal of this is to filter the source list like you would using Linq in c#. There may be other ways to do this in C++, but I need to understand how to use algorithms. My user-defined function object to use as my function adapter is <pre><code>struct is_Selected_Source : public std::binary_function<SOURCE_DATA *, SOURCE_TYPE, bool> { bool operator()(SOURCE_DATA * test, SOURCE_TYPE ref)const { if (ref == SOURCE_All) return true; return test->Value == ref; } }; </code></pre> And in my main program, I'm using as follows - <pre><code>typedef std::list<SOURCE_DATA *> LIST; LIST; *localList = new LIST;; LIST* msg = GLOBAL_DATA->MessageList; SOURCE_TYPE _filter_Msgs_Source = SOURCE_TYPE::SOURCE_All; std::remove_copy(msg->begin(), msg->end(), localList->begin(), std::bind1st(is_Selected_Source<SOURCE_DATA*, SOURCE_TYPE>(), _filter_Msgs_Source)); </code></pre> What I'm getting the following error in Rad Studio 2010. The error means "Your source file used a typedef symbol where a variable should appear in an expression. " <blockquote> "E2108 Improper use of typedef 'is_Selected_Source'" </blockquote> <hr> Edit - After doing more experimentation in VS2010, which has better compiler diagnostics, I found the problem is that the definition of remove_copy only allows uniary functions. I change the function to uniary and got it to work.
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<c++><stl><c++builder>
Title
Syntax for std::binary_function usage
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1. PO
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1. USKromster
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1. USphoto_tom
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