[Coin-discuss] CoinAssert

[John J Forrest]

There was some discussion that users may want to trap asserts so I have 
extended CoinError and introduced CoinAssert, CoinAssertHint, 
CoinAssertDebug and CoinAssertDebugHint.  The debug versions are always 
null if -DNDEBUG is given as compile option and the Hint versions contain 
some hint as to what the user error might be.  With the current build 
options these all translate to assert.  But if -DCOIN_ASSERT is given as 
compile option then they throw a CoinError exception which the user can 
trap.

So in Clp/Samples/addRows.cpp the code is surrounded by:

try {
           ..... code
      }
 catch (CoinError e) {
    e.print();
    if (e.lineNumber()>=0)
       std::cout<<"This was from a CoinAssert"<<std::endl;
} 

and the result is

ClpModel::1372 : assertion 'numberColumns<numberColumns_' failed.
Possible reason: rows having column indices >= numberColumns_

I have replaced some asserts in Clp by CoinAssert and will change any 
others which people want changed.

CoinAssert can obviously be used by anyone.  COIN_ASSERT may be made 
default if optimized but it may not work with all compilers and someone 
may be able to improve my #defines to give more information e.g. I don't 
know how to get function name while normal assert does.

John Forrest
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