[petsc-dev] wrong PETSc code, please read the PETSc style guide

[Jed Brown]

On Mon, Sep 17, 2012 at 8:27 PM, Barry Smith <bsmith at mcs.anl.gov> wrote:

> So it is ok to do  if (fl == 0.0)   but not (!fl)?  How are they different?


It means the wrong thing in C++. Specifically, it tries to convert the
number to bool since there is no std::complex<T>::operator!(T), but
std::complex does not provide a conversion to bool either. This produces
errors like

error: invalid argument type 'std::complex<double>' to unary expression
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