Nov 19, 2016 · Is it possible to concatenate the two preprocessor values without having a space in between? Update: I changed the language because the question was about the preprocessor and not about the language. I actually needed it for LSL, even though I initially formulated the question with C syntax, which is familiar to more users, but LSL does not ...

Mar 10, 2011 · This example can clarify further, based on this great answer. #include <iostream> // Pass argument through, do nothing #define MACRO1(arg) arg // Turn argument into a string literal without expanding macro definitions #define MACRO2(arg) #arg // however, if invoked from a macro, macro arguments are expanded #define MACRO3(arg) MACRO2(arg) // Concatenate …

Mar 11, 2014 · #define mkstr(s) #s mkstr(foo) // is the same as "foo" So in your case, #define PROJX(id) "..\\" #id "_data_var.h" #define PROJ(id) PROJX(id) #define PROJECT PROJ(ID) might be one way to go. Another alternative is. #define mkstrX(s) #s #define mkstr(s) mkstrX(s) #define PROJECT "..\\" mkstr(ID) "_data_var.h" which does the same, getting a result of

Dec 15, 2014 · is it possible to concatenate strings during preprocessing? I found this example. #define H "Hello " #define W "World!" #define HW H W printf(HW); // Prints "Hello World!" However it does not work for me - prints out "Hello" when I use gcc -std=c99. UPD This example looks like working now. However, is it a normal feature of c preprocessor?

macro function can concatenate two string literals - #define STRCAT(str1, str2) str1##str2. And when it comes to variables, you use strcat() More efficient approach is to use string managing utilities such as GString. It keeps track of the end of string and it …

Sep 15, 2015 · CONCATENATE_SCRIPTS is the constant that tells wordpress to, well.. concatenate all of the dependencies into one URL and load it together ( to save http requests I guess ). As far as I know, it applies only to the Admin area ( back end ). The result is a url like

Dec 4, 2012 · For your case to work, you can either let the compiler concatenate them: #define STRING "string 1" std::string string2 = STRING "string3" which works only for string literals (constant strings that are defined within your source code), or in general you'd have to make a std::string out of it first, which has an operator+ overload, that allows ...

Feb 27, 2018 · I'm trying to figure out how I can concatenate a #define'd int to a #define'd string using the C Preprocessor. My compiler is GCC 4.1 on CentOS 5. The solution should also work for MinGW. I'd like to append a version number onto a string, but the only way I can get it to work is to make a copy of the version number defines as strings.

May 4, 2016 · #define space_conc(str1,str2) #str1 " " #str2 The '##' is used to concatenate symbols, not strings. Strings can simply be juxtaposed in C, and the compiler will concatenate them, which is what this macro does.

The other answers just don't explicitly mention it because a one-liner was the very premise of the question, which is "How do I concatenate multiple C++ strings on one line?". You should really turn down your arrogant tone a bit. Also, you are making performance tests and other "leet stuff", yet flush your output-buffer after every output...