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POC++: hiding some functions
 

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    <p>I redefined some maths functions (so that they're faster -ie: less accurate-, or use templates). I put these functions in a namespace and they work just fine.</p> <p>It happens often, though, that I forget to call functions from my namespace (ie: I forget to write <code>mymath::cos</code> or <code>using mymath::cos;</code> when I want to call <code>cos</code>), and it's pretty tough to find out where I forgot it (until now I found it out only by profiling).</p> <p>Given that</p> <ul> <li>I <strong>only</strong> include standard <code>math.h</code> or <code>cmath</code> headers within my math header, and that</li> <li>I need to include standard math headers (because some of my functions are just wrappers for standard one, and I want them to be inline or they're templated),</li> </ul> <p>is there a portable way to <em>hide</em> standard math function so that a compile error is reported, if global namespace (ie: without a namespace) math functions are used?</p> <p>A solution could be putting an <code>using namespace mymath;</code> at the bottom of my math header file, but this solution doesn't seem that great: it breaks the whole purpose of namespaces; I'd prefer having to explicity say whether to use a function from <code>mymath</code> or from <code>std</code> so that I am forced to choose between a fester or a more accurate function without the risk of forgetting about it.</p> <hr> <p><strong>EDIT</strong>:</p> <p>Many answers say that if I use <code>cos</code> from global namespace (without using <code>std</code> nor <code>mymath</code>), and include <code>cmath</code> (and not <code>math.h</code>), compilation should fail.</p> <p>I don't know what the standard says about it, but:</p> <pre><code>#include &lt;cmath&gt; int main( ) { cos( M_PI ); return 0; } </code></pre> <p>compiles fine with GNU GCC (<code>g++</code>) 4.5.1 (and older versions).</p>
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    1. COYou're correct regarding the EDIT: "It is unspecified whether these names are first declared within the global namespace scope and are then injected into namespace std by explicit using-declarations".
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