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POAuto not being recognised by the compiler, what would be the best replacement?
 

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  1. POAuto not being recognised by the compiler, what would be the best replacement?
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    <p>So I have wrote a program that uses auto however the compiler doesn't seem to recognize it, probably it is an earlier compiler.</p> <p>I was wondering for my code, what are suitable variables to fix my code so that I do not need to use the auto keyword? I'm thinking a pointer to a string? or a string iterator, though I am not sure. </p> <pre><code> #include &lt;cstdlib&gt; #include &lt;string&gt; #include &lt;iostream&gt; #include &lt;unistd.h&gt; #include &lt;algorithm&gt; using namespace std; int main(int argc, char* argv[]) { enum MODE { WHOLE, PREFIX, SUFFIX, ANYWHERE, EMBEDDED } mode = WHOLE; bool reverse_match = false; int c; while ((c = getopt(argc, argv, ":wpsaev")) != -1) { switch (c) { case 'w': // pattern matches whole word mode = WHOLE; break; case 'p': // pattern matches prefix mode = PREFIX; break; case 'a': // pattern matches anywhere mode = ANYWHERE; break; case 's': // pattern matches suffix mode = SUFFIX; break; case 'e': // pattern matches anywhere mode = EMBEDDED; break; case 'v': // reverse sense of match reverse_match = true; break; } } argc -= optind; argv += optind; string pattern = argv[0]; string word; int matches = 0; while (cin &gt;&gt; word) { switch (mode) { case WHOLE: if (reverse_match) { if (pattern != word) { matches += 1; cout &lt;&lt; word &lt;&lt; endl; } } else if (pattern == word) { matches += 1; cout &lt;&lt; word &lt;&lt; endl; } break; case PREFIX: if (pattern.size() &lt;= word.size()) { auto res = mismatch(pattern.begin(), pattern.end(), word.begin()); if (reverse_match) { if (res.first != word.end()) { matches += 1; cout &lt;&lt; word &lt;&lt; endl; } } else if (res.first == word.end()) { matches += 1; cout &lt;&lt; word &lt;&lt; endl; } } break; case ANYWHERE: if (reverse_match) { if (!word.find(pattern) != string::npos) { matches += 1; cout &lt;&lt; word &lt;&lt; endl; } } else if (word.find(pattern) != string::npos) { matches += 1; cout &lt;&lt; word &lt;&lt; endl; } break; case SUFFIX: if (pattern.size() &lt;= word.size()) { auto res = mismatch(pattern.rbegin(), pattern.rend(), word.rbegin()); if (reverse_match) { if (res.first != word.rend()) { matches = +1; cout &lt;&lt; word &lt;&lt; endl; } } else if (res.first == word.rend()) { matches = +1; cout &lt;&lt; word &lt;&lt; endl; } } break; case EMBEDDED: if (reverse_match) { if (!pattern.find(word) != string::npos) { matches += 1; cout &lt;&lt; word &lt;&lt; endl;} } else if (pattern.find(word) != string::npos) { matches += 1; cout &lt;&lt; word &lt;&lt; endl; } break; } } return (matches == 0) ? 1 : 0; } </code></pre> <p>Thanks in advance!</p> <p>Errors I get:</p> <pre><code>main.cpp:70:26: error: 'res' does not name a type main.cpp:73:29: error: 'res' was not declared in this scope main.cpp:77:32: error: 'res' was not declared in this scope main.cpp:97:26: error: 'res' does not name a type main.cpp:100:29: error: 'res' was not declared in this scope main.cpp:104:32: error: 'res' was not declared in this scope </code></pre>
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    1. USuser1719605
    1. USuser1719605
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    1. COdefine "the compiler doesn't seem to recognize it". How? What are you expecting it to do? which line?
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      1. POAuto not being recognised by the compiler, what would be the best replacement?
      1. USAdam
    2. COWhich compiler?
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      1. POAuto not being recognised by the compiler, what would be the best replacement?
      1. USchris
    3. COThere isn't a one-size replacement, One of your uses is `std::pair<std::string::iterator,std::string::iterator>`, while one would instead use `std::pair<std::string::iterator,std::string::reverse_iterator>` But I'm more curious as to why `auto` isn't doing its job. So I second chris' question. **what compiler are you using?**
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      1. POAuto not being recognised by the compiler, what would be the best replacement?
      1. USWhozCraig
 

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