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POerror when using std::copy
 

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  1. POerror when using std::copy
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    <p>Hey guys I'm having trouble with some code I'm writing for a .obj model parser. Here's the code that's causing the problem:</p> <pre><code>std::istringstream iss(line.substr(1)); std::copy( std::istream_iterator&lt;float&gt;(iss), std::istream_iterator&lt;float&gt;(), std::back_inserter&lt;std::vector&lt;float&gt;&gt;(model.chunks.back().vectices) ); </code></pre> <p>It's basically taking a string passed as a argument like this:</p> <blockquote> <p>v -5.000000 -1.000000 1.000000</p> </blockquote> <p>Then gets the substring from it so it's left with only this:</p> <blockquote> <p>-5.000000 -1.000000 1.000000</p> </blockquote> <p>Finally I use std::copy and get each set of numbers from within the string:</p> <blockquote> <p>vertices[0] = -5.000000<br> vertices[1] = -1.000000<br> vertices[2] = 1.000000 </p> </blockquote> <p>Anyways the main problem here is that I'm getting an error from this line of code:</p> <pre><code>std::back_inserter&lt;std::vector&lt;float&gt;&gt;(model.chunks.back().vectices)); </code></pre> <p>It says "expected token ';' got float" my code still compiles and run's flawlessly though.</p> <p>Although if I replace the floats in that code with std::string's I don't get the error anymore.</p> <pre><code>std::copy( std::istream_iterator&lt;std::string&gt;(iss), std::istream_iterator&lt;std::string&gt;(), std::back_inserter&lt;std::vector&lt;std::string&gt;&gt;(model.chunks.back().vectices) ); </code></pre> <p>I'm using Qt Creator so could this possibly be just a IDE error? Any help would be greatly appreciated!</p>
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    1. USjleahy
    1. USluveti
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    1. COstd::back_inserter can deduce type from argument.
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      1. USForEveR
    2. COWhy don't you just write `std::back_inserter(model.chunks.back().vectices)` and let the compiler deduce the type argument?
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      1. USNawaz
    3. COHmm.. didn't think of that. It also requires less code. Thanks for the tip!
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      1. USluveti
 

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