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Questions tagged [boost-phoenix]

Boost.Phoenix is a C++ library to enable function programming in C++.

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Converting a Boost Spirit Lex semantic action to Phoenix - How to access _val?

I wrote a semantic action for my Boost Spirit Lexer to convert escape sequences in strings to what they stand for. It works perfectly and I want to convert it to a Boost Phoenix expression, but can't get that one to compile. Here is what works: //…
Felix Dombek
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qi::rule with inherited attribute as inherited attribute

Let's say we have a rule1 qi::rule rule1 = qi::int_[qi::_val=qi::_1]; And we decide getting an int as attribute is not enough, we also want to get the raw data (boost::iterator_range). We may have a lot of rules with…
wanghan02
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string to Boolean expression is not working c++

I have a following code to evaluate a Boolean string based on an string input. The code supposed to work like this: Boolean string: "((0|1)&3);" Sting input: "101" how's it working? each character in the input string is supposed to be…
H'H
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boost spirit and phoenix parsing into a std::string

How do I parse into a std::string with boost spirit and phoenix? For example, below I successfully parse 1234 into an int, but when I try to parse into a string the parse fails. If I replace qi::alnum with +qi::alnum then the parse succeeds but the…
JDiMatteo
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Can Boost Proto adapt structures to a getter setter type API

This seems like a common problem. I've got two massive sets of code that need to be glued together: one that uses simple structs to hold data, the other has APIs that only expose getter/setter methods. Is it possible to use Boost.Proto to define a…
Grisby_2133
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Boost Phoenix: Binding to reference members of structures?

I would like to use Boost Phoenix to generate a lambda function for use in a std::find_if operation on a structure that contains reference-type members. A contrived example is as follows: struct MyStruct { MyStruct() : x(0) {} int& x; …
Chris Kline
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using boost::lambda or boost::phoenix with std::find_if

I have a class like this class Foo { public: int GetID() const { return m_id; } private: int m_id; }; I want to use find_if on a vector full of Foo objects, like this: std::find_if(foos.begin(), foos.end(), ???.GetID() ==…
gartenriese
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Parsing with Boost Spirit, getting extra items

This is long with a lot of code, so I hope Stack Overflow can cope with it. :P I'm trying to write an SVG parser with Boost Spirit. I have a grammar that populates a vector with "Contours," which are vectors of "BezierPoints," which may represent…
AJM
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Boost spirit: Invalidate parser from member function

this article (boost spirit semantic action parameters) explains how to invalidate a match from a plain function with the signature void f(int attribute, const boost::fusion::unused_type& it, bool& mFlag) I would like to invalidate a match from a…
ChristophK
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Defining a symbol which may be part of a literal function in boost spirit

I am trying to read a mathematical function which depends on the symbol t with boost::spirit. In the example below, I'm trying evaluate the function "tan(t)" in t=1.2. Instead of having Exit: 1, value = 2.5721 I get Exit: 1, value = 1.2 I…
srossi
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Semantic action evaluated in grammar constructor (or not?)

I have been learning boost::spirit and have come across confusion that a semantic action is evaluated during grammar construction. The following code produces the output: string= My assumption is that this output as part of the semantic action…
Jimmy
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Boost spirit using local variables

I would like to define a rule based on a previously parsed value, i. e. the input string has the following structure: D or I . I keep in a local boolean variable whether the first read character is D or I. The…
haykart
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Boost spirit semantic action not invoked

I've been trying to parse a string with Boost Spirit like following: integer_count int1 int2 int3 ... intN Where N is the integer_count. For example, 5 1 2 3 4 5 The code is following: #define BOOST_SPIRIT_USE_PHOENIX_V3 #include…
haykart
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What's wrong with my boost phoenix lazy function?

I have the following code (using boost 1.55 on MSVC9): struct pair_first_impl { template struct result { typedef typename TPair::first_type type; }; template typename TPair::first_type const& operator() (TPair…
void.pointer
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boost lambda or phoenix problem: using std::for_each to operate on each element of a container

I ran into a problem while cleaning up some old code. This is the function: uint32_t ADT::get_connectivity_data( std::vector< std::vector > &output ) { output.resize(chunks.size()); for(chunk_vec_t::iterator it = chunks.begin(); it…
Raindog
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