Re: invalid type conversion when using C++ API

[Thomas D. Dean]

On 05/27/18 15:45, lqj1990 wrote:
> Hi all,
>
> I'm new to Octave. I want to use some function in Octave using C++ API.
> When I follow the tutorial
> https://octave.org/doc/interpreter/Standalone-Programs.html (A.3), I
> encounter an invalid type conversion problem.
>
> The compiler shows that:
> Severity        Code    Description     Project File    Line    Suppression 
> State
> Error   C2440   'static_cast': cannot convert from 'octave_idx_type *' to 'long
> *'      TestOctaveStandAlone
> c:\octave\octave-4.4.0\include\octave-4.4.0\octave\dim-vector.h 156     
>
> The problem is located in oct-refcount.h, for the functions:
> OCTAVE_ATOMIC_INCREMENT, OCTAVE_ATOMIC_DECREMENT,
> OCTAVE_ATOMIC_POST_INCREMENT, OCTAVE_ATOMIC_POST_DECREMENT, in which a
> variable x is converted from  octave_idx_type* to long*.
>
> How can I resolve the problem?
> I'm using VS2017, the compiler configuration is Debug, x64.
> The Octave version is 4.4.0.

This seems to work for me.  Octave 4.3.0+

> mkoctfile --link-stand-alone standalone.cc -o standalone
> ./standalone
Hello Octave world!
 11 12
 21 22

Tom Dean