Re: [boost] Concatenating int value to string ..??

Subject: Re: [boost] Concatenating int value to string ..??
From: Andrey Semashev (andrey.semashev_at_[hidden])
Date: 2013-11-02 07:14:11

On Saturday 02 November 2013 15:49:02 Rahul Mathur wrote:
> YES, it's a run time exception could you suggest how to handle this ..
> 
> 
> On Sat, Nov 2, 2013 at 3:11 PM, Andrey Semashev
> 
> <andrey.semashev_at_[hidden]>wrote:
> > On Saturday 02 November 2013 15:05:45 Rahul Mathur wrote:
> > > On Sat, Nov 2, 2013 at 2:39 PM, Andrey Semashev
> > > 
> > > <andrey.semashev_at_[hidden]>wrote:
> > > > On Saturday 02 November 2013 14:14:18 Rahul Mathur wrote:
> > > > > All,
> > > > > 
> > > > > I wish to have string (combination of string value and int value)
> > 
> > which
> > 
> > > > > increments until 100. The code is as below -
> > > > > 
> > > > > ---
> > > > > #include <iostream>
> > > > > #include <cstdlib>
> > > > > #include <string>
> > > > > #include <boost/lexical_cast.hpp>
> > > > > 
> > > > > using namespace std;
> > > > > 
> > > > > int main() {
> > > > > 
> > > > >         std::string TID = "Apple";
> > > > >         int TagID = 01, Value = 000 /* 100 IDs*/;
> > > > >         std::string TagName, TagInitial, TagUId;
> > > > >         TagName = TID + boost::lexical_cast<std::string>(TagID); //
> > > > 
> > > > Should
> > > > 
> > > > > be as -> Apple01
> > > > > 
> > > > >         TagInitial = TagName +
> > 
> > boost::lexical_cast<std::string>(Value);
> > 
> > > > //
> > > > 
> > > > > Should be as -> Apple01000
> > > > > 
> > > > >         int i = boost::lexical_cast<int>(TagInitial) + 1; // Should
> > 
> > be
> > 
> > > > >         as
> > > > > 
> > > > > -> Apple01001
> > > > > 
> > > > >         TagUId = boost::lexical_cast<std::string>(i);
> > > > >         std::cout << "Tag ID .." << TagUId << endl;
> > > > > 
> > > > > }
> > > > > 
> > > > > I get below error message -
> > > > > 
> > > > > --
> > > > > terminate called after throwing an instance of
> > 
> > 'boost::exception_detail::clone_impl<boost::exception_detail::error_info_i
> > 
> > > > nj>
> > > > 
> > > > > ector<boost::bad_lexical_cast>
> > > > > 
> > > > > >'
> > > > > >
> > > > >   what():  bad lexical cast: source type value could not be
> > 
> > interpreted
> > 
> > > > as
> > > > 
> > > > > target
> > > > > Aborted (core dumped)
> > > > > --
> > > > > 
> > > > > Any clue?
> > > > 
> > > > Apple01000 cannot be interpreted as an integer, that's why
> > > > boost::lexical_cast<int>(TagInitial) throws.
> > > 
> > > I don't think so.
> > > 
> > > It compiled successfully ( $ g++ test.cpp -o test -lboost_system
> > > -lboost_thread ) with GCC-Boost v-1.54 but while linking and execution
> > > it
> > > gives error as shared.
> > > 
> > > I think if I can know - How to support lexical or what is the build
> > 
> > command
> > 
> > > to support lexical analysis of Boost during Boost-v1.54 build process
> > 
> > with
> > 
> > > toolset of gcc? I do see lexical_cast.hpp file in include file of
> > > Boost-v1.54 while building.
> > 
> > I don't understand. You get a run time exception. You do know that
> > lexical_cast operates at run time, don't you?
> > 
> > PS: Don't top post, please.

I'd maintain the counter separately from the prefix string and compose the 
final string every time it needs to be incremented.

PS: Don't top post, please.