[geos-devel] assert.h / assert()

[Mateusz Łoskot]

Artem Pavlenko wrote:
> Stephen,
> 
> GEOS is a c++ library, right? Please see [Stroustrup94],[Stroustrup00] 
> on the topic 'Why to avoid macros when possible'.

Yup, macros are not recommended besides those defined by C++ Standard.
Together with macros, it's possible to set permanent assertions that do 
not depends on NDEBUG definition.

template <class E, class A> inline void StaticAssert(A expr)
{
    if (!expr)
    {
       throw E();
    }
}

Usage:


class BadPolyException {};

MyPoly p;
// ... construct poly
// and check it
StaticAssert<BadPolyException>(p.IsClosed());

We don't need to catch exception, because it will work just as assert() 
macro and program execution will be terminated if StaticAssert return false.

It also can be tweaked to be enabled/disabled by NDEBUG.

Cheers
-- 
Mateusz Łoskot
http://mateusz.loskot.net