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POunable to use derived string class with ifstream class
 

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  1. POunable to use derived string class with ifstream class
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    <p>I have a <code>UtlString</code> class which is derived from <code>std::string</code> and added extra utilities like to convert int to string. But I am getting some error when I used this class with stream in below code</p> <pre><code>istream&amp; operator &gt;&gt; (istream&amp; stream, UtlDatePeriod&amp; object) { stream &gt;&gt; (object._startDate).AsString() &gt;&gt; (object._endDate).AsString(); //(object._startDate).AsString() returns UtlString by value. return stream; } </code></pre> <p>The error is:</p> <pre><code>error: no match for âoperator&gt;&gt;â in âstream &gt;&gt; std::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt; &gt;(((const std::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt; &gt;&amp;)((const std::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt; &gt;*)(&amp; jda::UtlDate::AsString() const().jda::UtlString::&lt;anonymous&gt;))))â /usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/istream:119: note: candidates are: std::basic_istream&lt;_CharT, _Traits&gt;&amp; std::basic_istream&lt;_CharT, _Traits&gt;::operator&gt;&gt;(std::basic_istream&lt;_CharT, _Traits&gt;&amp; (*)(std::basic_istream&lt;_CharT, _Traits&gt;&amp;)) [with _CharT = char, _Traits = std::char_traits&lt;char&gt;] /usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/istream:123: note: std::basic_istream&lt;_CharT, _Traits&gt;&amp; std::basic_istream&lt;_CharT, _Traits&gt;::operator&gt;&gt;(std::basic_ios&lt;_CharT, _Traits&gt;&amp; (*)(std::basic_ios&lt;_CharT, _Traits&gt;&amp;)) [with _CharT = char, _Traits = std::char_traits&lt;char&gt;] /usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/istream:130: note: std::basic_istream&lt;_CharT, _Traits&gt;&amp; std::basic_istream&lt;_CharT, _Traits&gt;::operator&gt;&gt;(std::ios_base&amp; (*)(std::ios_base&amp;)) [with _CharT = char, _Traits = std::char_traits&lt;char&gt;] /usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/istream:166: note: std::basic_istream&lt;_CharT, _Traits&gt;&amp; std::basic_istream&lt;_CharT, _Traits&gt;::operator&gt;&gt;(bool&amp;) [with _CharT = char, _Traits = std::char_traits&lt;char&gt;] /usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/istream:170: note: std::basic_istream&lt;_CharT, _Traits&gt;&amp; std::basic_istream&lt;_CharT, _Traits&gt;::operator&gt;&gt;(short int&amp;) [with _CharT = char, _Traits = std::char_traits&lt;char&gt;] /usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/istream:173: note: std::basic_istream&lt;_CharT, _Traits&gt;&amp; std::basic_istream&lt;_CharT, _Traits&gt;::operator&gt;&gt;(short unsigned int&amp;) [with _CharT = char, _Traits = std::char_traits&lt;char&gt;] /usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/istream:177: note: std::basic_istream&lt;_CharT, _Traits&gt;&amp; std::basic_istream&lt;_CharT, _Traits&gt;::operator&gt;&gt;(int&amp;) [with _CharT = char, _Traits = std::char_traits&lt;char&gt;] /usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/istream:180: note: std::basic_istream&lt;_CharT, _Traits&gt;&amp; std::basic_istream&lt;_CharT, _Traits&gt;::operator&gt;&gt;(unsigned int&amp;) [with _CharT = char, _Traits = std::char_traits&lt;char&gt;] /usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/istream:184: note: std::basic_istream&lt;_CharT, _Traits&gt;&amp; std::basic_istream&lt;_CharT, _Traits&gt;::operator&gt;&gt;(long int&amp;) [with _CharT = char, _Traits = std::char_traits&lt;char&gt;] /usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/istream:188: note: std::basic_istream&lt;_CharT, _Traits&gt;&amp; std::basic_istream&lt;_CharT, _Traits&gt;::operator&gt;&gt;(long unsigned int&amp;) [with _CharT = char, _Traits = std::char_traits&lt;char&gt;] /usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/istream:193: note: std::basic_istream&lt;_CharT, _Traits&gt;&amp; std::basic_istream&lt;_CharT, _Traits&gt;::operator&gt;&gt;(long long int&amp;) [with _CharT = char, _Traits = std::char_traits&lt;char&gt;] /usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/istream:197: note: std::basic_istream&lt;_CharT, _Traits&gt;&amp; std::basic_istream&lt;_CharT, _Traits&gt;::operator&gt;&gt;(long long unsigned int&amp;) [with _CharT = char, _Traits = std::char_traits&lt;char&gt;] /usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/istream:202: note: std::basic_istream&lt;_CharT, _Traits&gt;&amp; std::basic_istream&lt;_CharT, _Traits&gt;::operator&gt;&gt;(float&amp;) [with _CharT = char, _Traits = std::char_traits&lt;char&gt;] /usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/istream:206: note: std::basic_istream&lt;_CharT, _Traits&gt;&amp; std::basic_istream&lt;_CharT, _Traits&gt;::operator&gt;&gt;(double&amp;) [with _CharT = char, _Traits = std::char_traits&lt;char&gt;] /usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/istream:210: note: std::basic_istream&lt;_CharT, _Traits&gt;&amp; std::basic_istream&lt;_CharT, _Traits&gt;::operator&gt;&gt;(long double&amp;) [with _CharT = char, _Traits = std::char_traits&lt;char&gt;] /usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/istream:214: note: std::basic_istream&lt;_CharT, _Traits&gt;&amp; std::basic_istream&lt;_CharT, _Traits&gt;::operator&gt;&gt;(void*&amp;) [with _CharT = char, _Traits = std::char_traits&lt;char&gt;] /usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/istream:238: note: std::basic_istream&lt;_CharT, _Traits&gt;&amp; std::basic_istream&lt;_CharT, _Traits&gt;::operator&gt;&gt;(std::basic_streambuf&lt;_CharT, _Traits&gt;*) [with _CharT = char, _Traits = std::char_traits&lt;char&gt;] /usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/bits/basic_string.h:2485: note: std::basic_istream&lt;_CharT, _Traits&gt;&amp; std::operator&gt;&gt;(std::basic_istream&lt;_CharT, _Traits&gt;&amp;, std::basic_string&lt;_CharT, _Traits, _Alloc&gt;&amp;) [with _CharT = char, _Traits = std::char_traits&lt;char&gt;, _Alloc = std::allocator&lt;char&gt;] </code></pre>
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      1. VTUpMod
    1. CODeriving from `std::string` is bad mojo. I think using composition rather than inheritance would make your problem much easier to solve.
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