Re: Boost unittest

James Kanze <>
Thu, 7 Aug 2008 02:15:50 -0700 (PDT)
On Aug 7, 9:18 am, Michael DOUBEZ <> wrote:

saneman a =E9crit :

<> skrev i en meddelelse
On Aug 6, 12:34 pm, "saneman" <> wrote:

// Types
std::vector<int> v;
v.push_back(22); //This gives an error!

You can't use the global namespace for everything.

Out of curiosity why not? Is it a special boost thing?

It is something specific to many compiled languages: you have
only one entry point of execution (i.e. main() in C++) and
code get executed from there only. The only exception in C++
being the construction of globals for initialisation. In all
cases code is executed from within a function.

Actually, as you point out later, this isn't true of C++. You
can add additional entry points anywhere you like, just by
defining a variable with static lifetime, e.g.:

    static bool dummyForInitialization = (startUpFunction(), true) ;

(Generally speaking, I'd prefer having the startUpFunction
return a bool, and drop the comma operator. But I did it this
way to show that it can easily be done with any function.)

Concerning your question:
  1. if you need only one value in your global, you can use:
      std::vector<int> v(1,22);//vector of size one filled with 22

In this particular case, that's obviously the solution. More
generally, however, he could do something like:

    std::vector< int > v ;
    bool dummyForInitialization = (v.push_back( 22 ), true) ;

(I'm not saying that he should, of course:-). Only that the
possibility exists.)

  2. For unit test, usual practice is to set up the environement before
the test such that tests are independant.

I'd say that that is almost a requirement, no?

James Kanze (GABI Software)
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