Is it possible to use a if statement inside #define?
There are multiple problems with your macro: it expands to a statement, so you cannot use it as an expression the arguments are not properly parenthesized in the expansion: invoking this …
c++ - Why use #define instead of a variable - Stack Overflow
May 14, 2011 · 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.
Why are #ifndef and #define used in C++ header files?
I have been seeing code like this usually in the start of header files: #ifndef HEADERFILE_H #define HEADERFILE_H And at the end of the file is #endif What is the purpose of this?
c++ - Declaring a function using #define - Stack Overflow
Jul 9, 2018 · The #define version is still a macro. The code is expanded at the invocation site. It has all the expected problems (with macros) including namespace pollution and unexpected …
How do I define a function with optional arguments?
How do I define a function with optional arguments? Asked 13 years, 5 months ago Modified 1 year, 1 month ago Viewed 1.2m times
Creating an empty Pandas DataFrame, and then filling it
It is always cheaper to append to a list and create a DataFrame in one go than it is to create an empty DataFrame (or one of NaNs) and append to it over and over again. Lists also take up …
Is there a way to do a #define inside of another #define?
I know that I am trying to shoot myself in the leg ;) However, it will allow me to make the rest (big amount) of code smaller and more readable. Is there any tricky way to create preprocessor …
What is the purpose of the #define directive in C++?
May 10, 2010 · 0 in C or C++ #define allows you to create preprocessor Macros. In the normal C or C++ build process the first thing that happens is that the PreProcessor runs, the …
c++ - 'static const' vs. '#define' - Stack Overflow
Oct 28, 2009 · Is it better to use static const variables than #define preprocessor? Or does it maybe depend on the context? What are advantages/disadvantages for each method?
How to set the python type hinting for a dictionary variable?
Oct 1, 2018 · @topher217 'dict' and 'list' are actually the class names. I believe that's to distinguish built-ins from non-built-ins as apposed to primitive vs non primitive. User-defined …