preprocessor

问题 I am trying to get the absolute path of the compiled file at compile time in C++. I am aware of the __FILE__ macro - however, the macro can be evaluated to either absolute path, or a relative path, depending on the preprocessor's arguments. I would like to ensure that my __FILE__ (or any other macro) evaluates to a full, absolute path of the file. Is there a way to reliably do it cross-platform? (I am compiling for VS2013, VS2015, GCC on ubuntu, GCC on MinGW) 来源： https://stackoverflow.com

问题 I transformed data to attend to the requirements of a linear model (normally distributed): d.reg1 = d.reg %>% preProcess("YeoJohnson") %>% predict(d.reg) The adjusted model: fit = lm(log10(Qmld)~log10(Peq750), data = d.reg1) #potential regression Predicted data: a=10^fit$coefficients[1] b=fit$coefficients[2] d.reg1$Qmld_predita=a*d.reg1$Peq750^b How could I untransform d.reg1$Qmld_predita , since the model was fitted to transformed data and this has no physical significance for me? 回答1: Here

问题 If I process the following test.def input file with gcc -C -x c -E test.def : #define TEST foo int TEST; I would like the output to be just: int foo; Instead I get: # 1 "test.def" # 1 "<built-in>" # 1 "<command-line>" # 1 "test.def" int foo; Is there a way I can omit those extra lines at the top? 回答1: These are not just on the top - but instead they're the line markers that the C preprocessors use to convey the source code positions where certain lines come from, to the C compiler. With GCC

问题 I am writing code for an Arduino. The code starts to get long so I want to use some debugging macros, and to be able to show some debugging information on serial port. For example, I have some macros to define which serial ports I use: #define SERIAL_GPS Serial1 #define SERIAL_IRIDIUM Serial2 #define SERIAL_VN100 Serial3 How can I write a macro to show the ports I use for each one? I.e. some macro that would print on a debug serial port: Port for GPS: Serial1 Port for Iridium: Serial2 Port

问题 really. weird. shiz. When I do a TFS Team Build (with Remote Deploy ), some #if DEBUG preprocessor directives code I have on a web page does not get called. When i manually one-click deploy (remote deploy) the preprocessor directive code works. When I debug locally, the code also works. So - problem looks to be related to my configuration settings for the Build Template i have (I think??). So, this is what I have :- Nothing too hard. That says ... Please kind Compiler. Build my project (read:

问题 I know the #warning directive does not exist in vb.net... is there anything like it? I want to be able to throw messages (warnings) at compiler time. 回答1: As far as I've ever been able to find... no. 回答2: It's not the same as preprocessor warning, but in the most cases where I need a warning for the user I generate one using the ObsoleteAttribute: <ObsoleteAttribute("You should no used this method!", False)> Sub MySub() End Sub However, since it is not the same as a preprocessor warning it

问题 I just started learning machine learning, when practicing one of the task, I am getting value error, but I followed the same steps as the instructor does. I am getting value error, please help. dff Country Name 0 AUS Sri 1 USA Vignesh 2 IND Pechi 3 USA Raj First I performed labelencoding, X=dff.values label_encoder=LabelEncoder() X[:,0]=label_encoder.fit_transform(X[:,0]) out: X array([[0, 'Sri'], [2, 'Vignesh'], [1, 'Pechi'], [2, 'Raj']], dtype=object) then performed One hot encoding for the

问题 I just started learning machine learning, when practicing one of the task, I am getting value error, but I followed the same steps as the instructor does. I am getting value error, please help. dff Country Name 0 AUS Sri 1 USA Vignesh 2 IND Pechi 3 USA Raj First I performed labelencoding, X=dff.values label_encoder=LabelEncoder() X[:,0]=label_encoder.fit_transform(X[:,0]) out: X array([[0, 'Sri'], [2, 'Vignesh'], [1, 'Pechi'], [2, 'Raj']], dtype=object) then performed One hot encoding for the

问题 This question already has answers here : Detecting if iOS app is run in debugger (8 answers) Closed 4 years ago . I'm trying to enable/disable parts of my code based on whether or not the code be being run via USB/Xcode (debug), or in production mode downloaded from the app store (release). I'm aware of checking if it is running in DEBUG or RELEASE mode like this: #ifdef DEBUG // Stuff for debug mode #else // Stuff for release mode #endif but the problem is that an obvious loop-hole I see is

问题 GLSL has a full C-style preprocessor. The only thing that does not work is #include. One of the great features is that that you can used #ifdef to comment out functions and thus create one shader that can be thinned out if certain features are not used. My Question is: Is there a way to define a macro from C code? There seems no way to do that with the openGL interface. The quick hack is to prepend a few lines with #define FOO before the code loaded form file. But it seems kind of backwards.