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    <p>In my last job, I was working on a virus scanner. To make thing easier for me to debug, I had lots of logging stuck all over the place, but in a high demand app like that, the expense of a function call is just too expensive. So, I came up with this little Macro, that still allowed me to enable the debug logging on a release version at a customers site, without the cost of a function call would check the debug flag and just return without logging anything, or if enabled, would do the logging... The macro was defined as follows:</p> <pre><code>#define dbgmsg(_FORMAT, ...) if((debugmsg_flag &amp; 0x00000001) || (debugmsg_flag &amp; 0x80000000)) { log_dbgmsg(_FORMAT, __VA_ARGS__); } </code></pre> <p>Because of the VA_ARGS in the log functions, this was a good case for a macro like this.</p> <p>Before that, I used a macro in a high security application that needed to tell the user that they didn't have the correct access, and it would tell them what flag they needed.</p> <p>The Macro(s) defined as:</p> <pre><code>#define SECURITY_CHECK(lRequiredSecRoles) if(!DoSecurityCheck(lRequiredSecRoles, #lRequiredSecRoles, true)) return #define SECURITY_CHECK_QUIET(lRequiredSecRoles) (DoSecurityCheck(lRequiredSecRoles, #lRequiredSecRoles, false)) </code></pre> <p>Then, we could just sprinkle the checks all over the UI, and it would tell you which roles were allowed to perform the action you tried to do, if you didn't already have that role. The reason for two of them was to return a value in some places, and return from a void function in others...</p> <pre><code>SECURITY_CHECK(ROLE_BUSINESS_INFORMATION_STEWARD | ROLE_WORKER_ADMINISTRATOR); LRESULT CAddPerson1::OnWizardNext() { if(m_Role.GetItemData(m_Role.GetCurSel()) == parent-&gt;ROLE_EMPLOYEE) { SECURITY_CHECK(ROLE_WORKER_ADMINISTRATOR | ROLE_BUSINESS_INFORMATION_STEWARD ) -1; } else if(m_Role.GetItemData(m_Role.GetCurSel()) == parent-&gt;ROLE_CONTINGENT) { SECURITY_CHECK(ROLE_CONTINGENT_WORKER_ADMINISTRATOR | ROLE_BUSINESS_INFORMATION_STEWARD | ROLE_WORKER_ADMINISTRATOR) -1; } ... </code></pre> <p>Anyways, that's how I've used them, and I'm not sure how this could have been helped with templates... Other than that, I try to avoid them, unless REALLY necessary.</p>
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    1. POWhen are C++ macros beneficial?
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