Re: Exception handling?

From:
Sana <sanatakos@gmail.com>
Newsgroups:
comp.lang.c++
Date:
Fri, 20 Feb 2009 12:56:59 -0800 (PST)
Message-ID:
<7b7a8194-f044-4e8e-89ec-accd2f4f7952@f11g2000vbf.googlegroups.com>
On Feb 20, 2:33 pm, "mlt" <a...@asd.com> wrote:

In the constructor of a class I run various test to check that the input
data is valid, else I throw an exception:

...
...
My Test(
          int const k
        , int const h
        , U const & u
        , U const & v
        , P const & c
        )
      {

    int controlnum = c.size() * c[0].size();
    int basisnum = (u() - k) * (v.size() - h);

        if(k<= 0 || h<=0)
          throw std::invalid_argument("k h must be greater than=

 zero");

        if(uknots.size() <= 0)
          throw std::invalid_argument("u was empty");

        if(vknots.size() <= 0)
          throw std::invalid_argument("v was empty");

        if(controls.size() <= 0)
          throw std::invalid_argument("c was empty");
...
...
      }

The first thing that needs to be done is to catch the exceptions so the
error messages gets printed to the user. But how do I make sure the right
message is printed, do I make some sort of exception switch?


catch std::exception

try
{
    MyTest test(/* parameters here */);

    // stuff to do
}
catch (std::exception e)
{
    std::cout << e.what() << std::endl;
}

--
sana

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