Boost.Phoenix is a C++ library to enable function programming in C++.
Questions tagged [boost-phoenix]
159 questions
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votes
1 answer
Using boost phoenix, how can I invoke a find_if call with starts_with?
I'm trying to find an element in a vector of structs. The code works when searching in a case-sensitive manner. When I try enhancing it to be case-insensitive, I run into two issues.
Simply including boost/algorithm/string.hpp breaks the…
Graham Perks
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How can I extract a std::string with boost.spirit?
Using boost.spirit I try to parse simple command line of the form command:param1 param2...
to do so I created this parser:
(+(char_ - ':'))[ref(cmd) = _1]
>> ':'
>> (*char_)[ref(params) = _1]
The attribute types of the two compounds parser is…
Mathieu Pagé
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How to use a phoenix expression with boost::transform_iterator?
academicRobot
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how to create boost phoenix make_shared?
Is it possible to create boost phoenix lazy variant of std::make_shared? I mean, to make possible something like
namespace p = boost::phoenix;
...
expr = custom_parser[_a=p::make_shared(_1,_2,_3)] >> ...
One cannot use…
polytheme
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Can I stringify a Boost Phoenix expression?
Can I convert a Boost Phoenix expression into a representative string of C++? I could have:
stringify(_1<_2);
which might then produce a string containing something like:
template
struct foo {
auto operator()(T1 x1, T2 x2)
…
user2023370
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5
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1 answer
Transforming Function Bodies within Boost Phoenix Expressions
How can I also include function bodies in a transformation of a Boost Phoenix expression?
For example, I have built on the Lazy Functions section of the Boost Phoenix Starter Kit, and created a lazy addition function:
struct my_lazy_add_impl {
…
user2023370
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Transforming a Boost C++ Phoenix Expression Tree
In the Boost Phoenix article, "Transforming the Expression Tree", here, a set of specialisations of a custom invert_actions class, are used to invert binary arithmetic expressions. For example a+b becomes a-b; a*b becomes a/b; and vice versa for…
user2023370
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Why does this proto/phoenix toy example crash?
I am experimenting with proto and phoenix and what is one of my first toy examples crash and I have no idea where I should be looking at. Since someone on the #boost IRC channel told me to ensure that the phoenix expression tree is first deep copied…
Johannes Schaub - litb
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is there a better way of converting to upper case in boost spirit?
I did something along the lines of creating a struct for phoenix::function
struct to_upper_impl
{
template
struct result { typedef std::string type; };
std::string operator()(const std::string & s) const
{
return…
eddi
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How to access boost::variant members from Spirit::Qi rule?
I can't find a proper way how to access members of boost::variant using boost::phoenix in my Spirit-Qi grammar. Here is simple an example what I’m trying to achieve. (my whole grammar is much more complex, this is simple fragment where I'm testing…
rickba
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boost::phoenix try_ catch_all construct fails to compile
I'm writing a boost::spirit::qi grammar for date parsing.
#include
#include
#include
template < typename InputIterator >
struct date_rfc1123_grammar :
…
zmij
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4
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2 answers
Boost spirit changing variable value in semantic action
I want to change a local variable value in semantic action, like following:
#define BOOST_SPIRIT_USE_PHOENIX_V3
#include
#include
#include
namespace qi =…
haykart
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Boost phoenix or lambda library problem: removing elements from a std::vector
I recently ran into a problem that I thought boost::lambda or boost::phoenix could help be solve, but I was not able to get the syntax right and so I did it another way. What I wanted to do was remove all the elements in "strings" that were less…
Raindog
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Post callbacks to a task queue using boost::bind
Suppose I have a function called subscribe() that takes a callback handler, which will be called when the event is triggered.
Now, I have another version, called subscribe2(). Everything is the same except that, when triggered, it needs to post it…
ttrrxx
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4
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boost spirit qi on_error pass error_handler struct by reference
I have yet another blocker issue with Spirit Qi.
I have implemented error handling in a functor struct called error_handler.
This is passed to the grammar constructor by reference (see the MiniC example for Qi).
I then have on_errors defined…
namezero
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