Forbes: Insights From A Two-Year Journey To Define Outside-In Supply Chain Planning Processes Insights From A Two-Year Journey To Define Outside-In Supply Chain Planning Processes What is the point of #define in C++? I've only seen examples where it's used in place of a "magic number" but I don't see the point in just giving that value to a variable instead. In my last conversation with Roddy—when he could still talk—was on the need to define outside-in processes.
Twelve years ago, Roddy and I worked together at the same research firm. We often ... c++ - Why use #define instead of a variable - Stack Overflow The question is if users can define new macros in a macro, not if they can use macros in macros. I want to write a macro that spits out code based on the Boolean value of its parameter.
define value chain, So say DEF_CONST(true) should be expanded into const, and DEF_CONST(false) should be expanded into nothing. The #define directive is a preprocessor directive; the preprocessor replaces those macros by their body before the compiler even sees it. Think of it as an automatic search and replace of your source code. A const variable declaration declares an actual variable in the language, which you can use... well, like a real variable: take its address, pass it around, use it, cast/convert it, etc.
