First, having the Conditional attribute is not equivalent to having #if inside the method. Consider: ShowDebugString(MethodThatTakesAges()); With the real behaviour of ConditionalAttribute, MethodThatTakesAges doesn’t get called – the entire call including argument evaluation is removed from the compiler. Of course the other point is that it depends on the compile-time preprocessor symbols at the compile … Read more
They are not the same. The first one doesn’t work (I tested in gcc 4.4.1). Error message was: test.cc:1:15: warning: extra tokens at end of #ifdef directive If you want to check if multiple things are defined, use the second one.
private static final boolean enableFast = false; // … if (enableFast) { // This is removed at compile time } Conditionals like that shown above are evaluated at compile time. If instead you use this private static final boolean enableFast = “true”.equals(System.getProperty(“fast”)); Then any conditions dependent on enableFast will be evaluated by the JIT compiler. … Read more
Debug and Release are just labels for different solution configurations. You can add others if you want. A project I once worked on had one called “Debug Internal” which was used to turn on the in-house editing features of the application. You can see this if you go to Configuration Manager… (it’s on the Build … Read more
Unfortunately there is no cross platform macro which defines 32 / 64 bit across the major compilers. I’ve found the most effective way to do this is the following. First I pick my own representation. I prefer ENVIRONMENT64 / ENVIRONMENT32. Then I find out what all of the major compilers use for determining if it’s … Read more
use: #ifdef __linux__ //linux code goes here #elif _WIN32 // windows code goes here #else #endif
The Predefined Macros for OS site has a very complete list of checks. Here are a few of them, with links to where they’re found: Windows _WIN32 Both 32 bit and 64 bit _WIN64 64 bit only __CYGWIN__ Unix (Linux, *BSD, but not Mac OS X) See this related question on some of the pitfalls of using … Read more