BCB6 project to CB2007 problem.

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3 total messages Started by Gene Thu, 26 Jun 2008 07:27

#111

Author: Gene
Date: Thu, 26 Jun 2008 07:27

18 lines
1389 bytes

Hi, 
 I have got a compiling error saying "[BCC32 Error] switch1.cpp(40): E2034 Cannot convert 'std::_Vector_iterator<std::string,std::allocator<std::string> >' to 'std::string *'"
The code is as in below:

  std::vector<std::string> StringList;
  for (int i = 0; i < 10; i++) {
    StringList.push_back(IntToStr(i).c_str());
  }
  std::vector<std::string>::iterator it=StringList.begin();
  std::string* ctmp=it;
  ShowMessage(ctmp->c_str());

  It compiles ok in BCB6, but it is an error in C++ Builder 2007. Is it any compilation options I set wrong? Or C++ Builder 2007 is a lot stricter in grammar than BCB6? Can anyone give me help on this?

Thanks.

Gene.

Re: BCB6 project to CB2007 problem.

#112

Author: Leo Siefert
Date: Thu, 26 Jun 2008 13:53

27 lines
1796 bytes

Gene wrote:

>Cannot convert std::_Vector_iterator<std::string> to std::string *

You are attempting to do something that is dependent upon the
implementation of the STL. a vector iterator is allowed by the
standard to be an array pointer, but it does not have to be one. There
is nothing in the standard that allows this type of conversion.

This worked in BCB6 because that used a different STL which used
pointers as vector iterators, and does not work in CB2007 because it
uses a different STL.

Since this is an implementation dependent detail, you are best to use
code that does not rely on it. Either use vector<>::iterator as your
function parameters, etc. or convert to a pointer if necessary like
this:

	&*TheIterator;

In the code you posted, you can simply use the iterator itself with
pointer syntax (iterators to have * and -> implemented like pointers
do):

  ShowMessage(it->c_str());

 - Leo

Re: BCB6 project to CB2007 problem.

#113

Author: Gene
Date: Thu, 26 Jun 2008 14:45

6 lines
921 bytes

It works!

Thank you! Leo.

Gene

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