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    <p>Picking up a discussion with @v.oddou a couple of years later, C++17 has finally delivered a way to do the originally macro-based type-agnostic solution (preserved below) <em>without</em> going through macro uglyness.</p> <pre><code>template &lt; typename... Args &gt; std::string sstr( Args &amp;&amp;... args ) { std::ostringstream sstr; ( sstr &lt;&lt; std::dec &lt;&lt; ... &lt;&lt; args ); return sstr.str(); } </code></pre> <p>Usage:</p> <pre><code>int i = 42; std::string s = sstr( "i is: ", i ); puts( sstr( i ).c_str() ); Foo x( 42 ); throw std::runtime_error( sstr( "Foo is '", x, "', i is ", i ) ); </code></pre> <hr> <p><strong>Original answer:</strong></p> <p>Since "converting ... to string" is a recurring problem, I always define the <a href="http://rootdirectory.ddns.net/dokuwiki/doku.php?id=software:sstr" rel="noreferrer">SSTR()</a> macro in a central header of my C++ sources:</p> <pre><code>#include &lt;sstream&gt; #define SSTR( x ) static_cast&lt; std::ostringstream &amp; &gt;( \ ( std::ostringstream() &lt;&lt; std::dec &lt;&lt; x ) ).str() </code></pre> <p>Usage is as easy as could be:</p> <pre><code>int i = 42; std::string s = SSTR( "i is: " &lt;&lt; i ); puts( SSTR( i ).c_str() ); Foo x( 42 ); throw std::runtime_error( SSTR( "Foo is '" &lt;&lt; x &lt;&lt; "', i is " &lt;&lt; i ) ); </code></pre> <p>The above is C++98 compatible (if you cannot use C++11 <code>std::to_string</code>), and does not need any third-party includes (if you cannot use Boost <code>lexical_cast&lt;&gt;</code>); both these other solutions have a better performance though.</p>
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