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
144
votes
14 answers
How do I show the value of a #define at compile-time?
I am trying to figure out what version of Boost my code thinks it's using. I want to do something like this:
#error BOOST_VERSION
but the preprocessor does not expand BOOST_VERSION.
I know I could print it out at run-time from the program, and I…
Jim Hunziker
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77
votes
4 answers
Is the C99 preprocessor Turing complete?
After discovering the Boost preprocessor's capabilities I found myself wondering: Is the C99 preprocessor Turing complete?
If not, what does it lack to not qualify?
Anycorn
- 46,748
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28
votes
5 answers
D_WIN32_WINNT compiler warning with Boost
Not sure what to make of this error. Added -D_WIN32_WINNT=0x0501 to Visual Studio's "Command Line" options under Project Properties but it says it doesn't recognize it and the warning still appears.
I am also not sure how to add the Preprocessor…
bobber205
- 11,636
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13
votes
1 answer
Is Boost using legal C++ preprocessing directive syntax?
My (relatively old) C++ compiler choked on this file in Boost, which starts out as:
# /* Copyright (C) 2001
# * Housemarque Oy
# * http://www.housemarque.com
# *
# * Distributed under the Boost Software License, Version 1.0. (See
# *…
user541686
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12
votes
4 answers
Construct path for #include directive with macro
I would like to have include file paths dynamically created by a macro for a target-configuration-dependent part of my program.
for example, I would like to construct a macro that would be invoked like this:
#include TARGET_PATH_OF(header.h)
Which…
Richard Hodges
- 64,204
- 6
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11
votes
3 answers
Can I append to a preprocessor macro?
Is there any way in standard C—or with GNU extensions—to append stuff to a macro definition? E.g., given a macro defined as
#define List foo bar
can I append bas so that it List expands as if I’d defined it
#define List foo bar bas?
I was…
J. C. Salomon
- 3,693
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9
votes
3 answers
Register a C++ class so that later a function can iterate over all registered classes
I am trying to write an application that is loading its extensions dynamically during runtime. I used Boost Preprocessor library to write a preprocessor function that, given a list of names, declares a class for each name (and make all of them…
grisumbras
- 750
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8
votes
3 answers
Recursive explicit template instantiation to export symbols for a library
In my previous question I asked is recursive explicit template instantiation possible. I saw that it is indeed possible; however, this instantiation turns out to be effective locally only, the symbols of the recursively instantiated template are not…
H. Brandsmeier
- 917
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8
votes
1 answer
How do I count the number of macro arguments passed to a variadic macro?
I'm already most of the way there:
#include
#define COUNT(...) BOOST_PP_VARIADIC_SIZE(__VA_ARGS__)
COUNT(1,2,3)
COUNT(1,2)
COUNT(1)
COUNT()
Running this with -E flag in GCC outputs the following
3 2 1 1
When what I need…
quant
- 17,534
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6
votes
3 answers
Can BOOST_PP_DEFINED be implemented?
Is it possible to write a function-like C preprocessor macro that returns 1 if its argument is defined, and 0 otherwise? Lets call it BOOST_PP_DEFINED by analogy with the other boost preprocessor macros, which we can assume are also in play:
#define…
acm
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5
votes
1 answer
How to iterate over two Boost Preprocessor sequences at the same time?
I was wondering if the following can be done via Boost Preprocessor sequences. (Most of the SO questions as well as Boost Preprocessor examples talk about only 1 sequence)
#define seq1 (a)(b)(c)
#define seq2 (1)(2)(3)
// Now iterate over both of…
skgbanga
- 1,915
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5
votes
2 answers
How to use boost::preprocessor to unzip a sequence?
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…
user1899020
- 11,941
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5
votes
4 answers
Can we implement a max or min macro, which can take variable arguments (more than two parameters )
I want to implement a new max/min macro, which can take more than two parameter, for example:
#define max( ... ) ...
and then, I can use it like this:
max( p0, p1, p2, p3 )
max( 2, 4, 100 )
max( 1,2,3,4,5,6,7 ) -> 7
if this macro can help us to…
Hikari
- 293
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4
votes
1 answer
How does boost::function support template class with different length template parameters
I want to use boost preprocessor to declare template classes with different template variable length, basically like what boost::function does.
#if !BOOST_PP_IS_ITERATING
#ifndef D_EXAMPLE_H
#define D_EXAMPLE_H
#include
#include…
Jason
- 239
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4
votes
1 answer
How to separate the result of macro expansion into different arguments?
I'm writing some Boost.Preprocessor metaprogram, and I have the following problem. Consider the following macros (this is a simplification to illustrate the problem):
#define ITERATION_IMPL(p1, p2, p3, p4) ((p1),(p2),(p3),(p4))
#define…
Yakov Galka
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