Boost.Preprocessor is a library of C++ preprocessor metaprogramming tools including repetition and recursion
Boost.Preprocessor is a library of C++ preprocessor metaprogramming tools including repetition and recursion.
Questions tagged [boost-preprocessor]
158 questions
4
votes
2 answers
Avoid expansion of macros while using boost preprocessor sequences
I'm trying to get the OS and compiler name as a string in C++. Although there are many questions about this I did not find a definitive answer. So I tried to use Boost.Predef 1.55 which defines macros of the type BOOST_OS_ and…
Flamefire
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4
votes
3 answers
macro which defines new macros with an added prefix
We have a profiling framework which can be enabled and disabled at compile time.
All the various calls to the framework are done through macros, eg:
PROFILE_START(msg)
PROFILE_END(msg)
The macros then resolve to the actual profiler call when…
Steve Lorimer
- 22,912
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4
votes
1 answer
Use Boost Preprocessor to Parse sequence of elements
I have a macro defined which is
#define TYPES (height,int,10)(width,int,20)
How to expand this macro using Boost Preprocessor something like this?
int height = 10;
int width = 20;
at most i am able to get is height,int,10 and width,int,20 as…
bhawesh
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4
votes
1 answer
C Preprocessor, Macro "Overloading"
I'm trying to do some kind of Macro "Overloading", so that MACRO(something), gets expanded differently than MACRO(something, else).
Using a snippet I got from here (I'm not sure if it's 100% portable) and some functions from the Boost PP Library, I…
almosnow
- 2,546
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4
votes
2 answers
How to force processor to use result of expression before pasting
My code is
#define PASTE__(a, b) a##b
#define PASTE_(a, b) PASTE__(a, b)
#define PASTE(a, b) PASTE_(a, b)
int main()
{
PASTE(1, (1+3)/4);
return 0;
}
I would LIKE to have the result be
int main()
{
11;
return 0;
}
Compilable…
Bob
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4
votes
2 answers
Boost preprocessor program won't compile after change from Boost 1.55 to 1.57
I've written some preprocessor directives to generate functions for a class. With Boost 1.55 everything works fine. When I try to change to Boost 1.57 I've got some strange compile errors.
The program is:
#include
#include…
Franz
- 93
- 5
4
votes
1 answer
Iteration limit in Boost Preprocessor
I am writing a unit test using the Boost::Test framework for a comparison function. For each test case I create a series of input elements and compare them pairwise to check the return value of the comparison function for each pair. I can either…
petersohn
- 10,129
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4
votes
1 answer
Boost-pp: how to determine if a macro parameter is a tuple
A tuple is a comma-separated list enclosed by parens, e.g.
()
(,)
(thing,)
(2,3)
If I have
#define ISTUPLE(x) \\...
I'd like something like ISTUPLE(nope) to resolve to 0 and ISTUPLE((yep)) to resolve to 1.
[FWIW, I have _RTFM_'d a plenty.]
Clay Bridges
- 10,746
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4
votes
1 answer
Creating list of stringized macro arguments with variadics and late expansions
I have the following problem - given variable number of macro arguments argX to create a list of stringized arguments #argX
Example:
LIST(A, B) -> "A", "B"
LIST(A, B, C) -> "A", "B", "C"
I'm using Boost, so the above macro is not too difficult to…
user2971693
- 75
- 5
4
votes
1 answer
BOOST_PP_REPEAT with array
I have struct like :
struct E1
{
typedef boost::tuple<
boost::optional< N::type_A >, // N - namespace
boost::optional< N::type_B >,
...................
boost::optional< N::type_X > //arbitrary number of, maximal is 7
…
Khurshid Normuradov
- 1,506
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4
votes
1 answer
C++11 how to proxy class function having only its name and parent class?
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*…
myWallJSON
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3
votes
2 answers
Is Boost.Preprocessor self-contained?
I'm thinking about using Boost.Preprocessor in some project, but I don't want to make the entire Boost library a dependency.
Can I just copy it alone and get away with this? Otherwise, what are its dependencies?
uj2
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3
votes
3 answers
Why gcc breaks in recursively expanding macros
Good day,
I've faced with a strange problem while compiling very simple C++ program which leverages recursive macros expansion:
#define FINAL(a1, a2, a3) const char *p = "final values are: " #a1 " " #a2 " " #a3;
#define SPLIT(a1, a2) a1, a2
#define…
Vyacheslav Grigoryev
- 201
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3
votes
1 answer
Generate a set of tagged and indexed specializations of a class template using Boost.Preprocessor
There is a need to create a macro to generate a set of overloadings of a struct specialized by tag and index. I tried the following:
#include
template< typename /*tag*/, int /*index*/ >
struct S;
#define…
Tomilov Anatoliy
- 13,614
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3
votes
4 answers
C preprocessor macros: check if token was declared
This is for the C preprocessor experts:
How can I declare an enum with a list of some identifiers and later during the switch-statement check if an identifier was included in the list?
Example of what I need:
typedef enum { e1, e2, e3, e4, e5, e6 }…
Thomas
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