boost-preprocessor

How to use boost::preprocessor to unzip a sequence of pairs? For example, I have a sequence as below (comma between doesn't matter) (int,x)(double,y)(float,z) or (int,x),(double,y),(float,z) or ((int)(x))((double)(y))((float)(z)) and want to convert to int,double,float and x,y,z By using macor like UNZIP(i, seq) where i is the index. Unzipping of (int, x, 10)(double, y, 20)(float, z, 30) , i.e. sequence without commas between elements. LIVE DEMO #include <boost/preprocessor/punctuation/comma_if.hpp> #include <boost/preprocessor/seq/for_each_i.hpp> #include <boost/preprocessor/seq/pop_front.hpp

Usually when you write a CLI tool which accepts parameter you have to deal with them. Most of the time you want to switch between behaviours based on the value of an argument. The following is a common use case, where the program accepts a type and then prints something based on that type. I am using Boost to pre-process and auto generate the whole if-else branches. This is very nice in terms of maintainability as I only need to update a define when I introduce a new type. On the other hand it is quite far from being modern and elegant. I thought about using better-enums to avoid using the if

Having N difrent classes that have no public data fields, only methods (that do not overlap), how to create unifiing them all proxy class via boost preprocessor? For example we had classes: A that had method do(); and class B had method data(); . I wonder if there is a way (using Boost Preprocessor for example) to create a proxy class that would have all methods from A and B (here do() data() ) and a constructor taking in that pointers to that classes instances - one for A and one for B? So we would get api like such pseudocode: JOIN(A, B, C);// or if needed JOIN("path_to_A.h", "path_to_B.h",

I wonder if it is possible using boost::mpl/preprocessor or some noce C++11 features to create function proxy from class type and function name. Say we had: inline void set_email(const ::std::string& value); inline void set_email(const char* value); inside class Email. We know there is set_email function n it, we want to create a prox class with API like PROXY(Email, set_email, MyEmail) Email * email = new Email(); MyEmail * myEmail = new MyEmail(email); and have abilety to call any of set_email overloads.Is it possible and how to create such class that would proxy any number of overload

I asked the following question earlier, but the solution doesn't seem to work in this particular case. How do I print out a comma multiple times using Boost Preprocessor I am trying to expand a macro containing a comma conditionally. Here is an example illustrating the problem: #define TEST(...)\ BOOST_PP_REPEAT( \ BOOST_PP_VARIADIC_SIZE(__VA_ARGS__), \ MACRO, \ BOOST_PP_VARIADIC_TO_TUPLE(__VA_ARGS__)) #define MACRO(z, n, data) BOOST_PP_IF(1,MACRO_CONTAINING_COMMA(z, z),MACRO_CONTAINING_COMMA(z, z)) #define MACRO_CONTAINING_COMMA(_NAME, _NAME2) _NAME TIBRA_EATEN_COMMA() _NAME2 #define EATEN

I am trying to figure out how to use the Boost.Preprocessor library http://www.boost.org/doc/libs/release/libs/preprocessor to unfold a "generic" type for different specific types. Below I will ask this for a simple point class example. Given: struct Point##TYPE_SUFFIX_NAME { TYPE X; TYPE Y; // Other code }; I want to generate this type for different basic (POD) data types e.g.: PointF32, PointF64, PointI32 etc. where PointF32 would be: struct PointF32 { float X; float Y; }; That is, based on a list of types: short, int, long, float, double etc. I want to "unfold" the above type for these.