how to prevent "directory already exists error" in a makefile when using mkdir
I need to generate a directory in my makefile and I would like to not get the "directory already exists error" over and over even though I can easily ignore it. I mainly use mingw/msys but would like something that works across other shells/systems too. I tried this but it didn't work, any ideas? ifeq (,$(findstring $(OBJDIR),$(wildcard $(OBJDIR) ))) -mkdir $(OBJDIR) endif
How can I combine multiple ggplot2 elements into the return of a function?
If I try to manually compose some elements of a ggplot2 plot, it works just fine: > p <- ggplot(aes(x = mpg, y = hp), data = mtcars) > p + geom_vline(xintercept = 20) + geom_point(data = mtcars) But if I try to bundle some of the composition into a function, I get an error: > myFunction <- function() { + return( + geom_vline(xintercept = 20) + geom_point(data = mtcars) + ) + } > p <- ggplot(aes(x
How can you check whether a templated class has a member function?
Is it possible to write a template that changes behavior depending on if a certain member function is defined on a class? Here's a simple example of what I would want to write: template<class T> std::string optionalToString(T* obj) { if (FUNCTION_EXISTS(T->toString)) return obj->toString(); else return "toString not defined"; } So, if class T has toString() defined, then it uses it; otherwise, it
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