RE: boost::spirit and boost in general for c++ people.

  • From: "Ken Perry" <whistler@xxxxxxxxxxxxx>
  • To: <programmingblind@xxxxxxxxxxxxx>
  • Date: Thu, 7 Apr 2011 13:12:24 -0400

The four  I use most of all are file system, regex, threads and path.  It
made porting my server from Mac to Linux to windows pretty easy.  I have
some socket issues I am still dealing with but soon I will have a version of
the server that runs on all three which is not a small accomplishment with
the compiler and server I have.



Ken

-----Original Message-----
From: programmingblind-bounce@xxxxxxxxxxxxx
[mailto:programmingblind-bounce@xxxxxxxxxxxxx] On Behalf Of Littlefield,
Tyler
Sent: Thursday, April 07, 2011 11:12 AM
To: programmingblind@xxxxxxxxxxxxx
Subject: Re: boost::spirit and boost in general for c++ people.

Ken promoted boost::any (which I won't use), boost::serialization (which 
again is huge). There are some good tools in boost, but not all of them 
are really worth using. boost::iostreams, boost::serialization, 
boost::any are some that come to mind.
On 4/7/2011 8:35 AM, Jared Wright wrote:
> Ahahaha, I distinctly remember many such exchanges. Classic. Nice 
> demo, Ty.
> On 4/7/2011 10:06 AM, Ken Perry wrote:
>> Snicker welcome to the future... Hmm how many times have I told you 
>> to use
>> it and you told me no???
>>
>> Ken
>>
>> -----Original Message-----
>> From: programmingblind-bounce@xxxxxxxxxxxxx
>> [mailto:programmingblind-bounce@xxxxxxxxxxxxx] On Behalf Of Littlefield,
>> Tyler
>> Sent: Thursday, April 07, 2011 9:09 AM
>> To: programmingblind@xxxxxxxxxxxxx
>> Subject: boost::spirit and boost in general for c++ people.
>>
>> hello all:
>> Recently I got into using boost a bit and started finding uses for it
>> all over the place. I would like to encourage those who haven't yet and
>> use c++ to check it out; it is quite powerful and can eas some of your
>> work and provide really cool features along the way. For example:
>> boost::function lets you take callbacks in multiple forms; boost::bind
>> will let you bind a functor to it's arguments and pass that as your
>> callback, which means you can bind to a static member function, a member
>> function (and pass the object with boost::ref), a global function and
>> you can also use boost::lambda.
>> There are many more utilities out there; I highly recommend checking out
>> boost::asio, boost::fusion, boost::function and boost::bind.
>> In the spirit of convincing you all, I wrote a small calculator program
>> that does single operations (1+3, 3*5), etc and returns the result.
>> My next step is to split up my parsing into different rulesets and then
>> work on generating an AST so that I can handle larger more complex
>> calculations.
>> /*
>> A simple calculator, supports multiplication, division, addition and
>> subtraction.
>> */
>> #include<boost/spirit/include/qi.hpp>
>> #include<boost/spirit/include/phoenix_core.hpp>
>> #include<boost/spirit/include/phoenix_operator.hpp>
>> #include<boost/spirit/include/phoenix_operator.hpp>
>> #include<iostream>
>> #include<string>
>> #include<boost/fusion/include/adapt_struct.hpp>
>> #include<boost/fusion/container/vector.hpp>
>> #include<boost/fusion/container/vector/convert.hpp>
>> #include<boost/fusion/include/io.hpp>
>>
>> namespace qi = boost::spirit::qi;
>> namespace ascii = boost::spirit::ascii;
>> namespace phoenix = boost::phoenix;
>>
>> struct calculation
>> {
>>     int a, b;
>>     char op;
>> };
>> BOOST_FUSION_ADAPT_STRUCT(calculation, (int, a) (char, op) (int, b) )
>>
>> template<typename iterator>
>> class CParser:public qi::grammar<iterator, calculation(),
>> qi::ascii::space_type>
>> {
>>     qi::rule<iterator, calculation(), qi::ascii::space_type>  crule;
>> public:
>>     CParser():CParser::base_type(crule)
>>     {
>>       using qi::ascii::char_;
>>       using qi::int_;
>>
>>       crule %= (int_>>
>>                 (char_('+')|char_('-')|char_('*')|char_('/'))>>
>>                 int_);
>>     }
>> };
>>
>> int main()
>> {
>>     CParser<std::string::iterator>  p;
>>     std::string str;
>>     calculation result;
>>
>>     std::cout<<  "Enter your calculation>";
>> getline(std::cin, str);
>>
>>     bool r = phrase_parse(str.begin(), str.end(), p, qi::ascii::space,
>> result);
>>     if (r)
>>       {
>>         std::cout<<  "a: "<<  result.a<<  " b: "<<  result.b<<  " op: "
>> <<  result.op<<  std::endl;
>>         switch(result.op)
>>           {
>>           case '+':
>>             std::cout<<  "Result: "<<  (result.a + result.b)<<  
>> std::endl;
>>             break;
>>           case '-':
>>             std::cout<<  "result: "<<  (result.a - result.b)<<  
>> std::endl;
>>             break;
>>           case '*':
>>             std::cout<<  "Result: "<<  (result.a * result.b)<<  
>> std::endl;
>>             break;
>>           case '/':
>>             if (result.a == 0)
>>               {
>>                 std::cout<<  "Division by zero error."<<  std::endl;
>>                 break;
>>               }
>>             std::cout<<  "result: "<<  (result.a / result.b)<<  
>> std::endl;
>>             break;
>>           default:
>>             std::cout<<  "Invalid operation."<<  std::endl;
>>           }
>>       }
>>     else
>>       {
>>         std::cout<<  "Invalid input."<<  std::endl;
>>       }
>>
>>     return 0;
>> }
>>
>
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-- 

Thanks,
Ty

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