Compile problem ov.cc of octave-3.1.51 on cygwin

[Tatsuro MATSUOKA]

Hello Jaroslav

Thank you for your reply.


--- Jaroslav Hajek <highegg at gmail.com> wrote:

> This  does not occur with g++ 4.2.1. Apparently the compiler is unable
> to convert octave_int<int32_t> to default int. I'm not sure how
> octave_idx_type comes into play because the offending line ov.cc:1361
> requests a conversion from int32NDArray to Array<int>.
> Can you try to compile the following simple test in the liboctave directory?
> test.cc:
> #include "config.h"
> #include "oct-inttypes.h"
> int main()
> {
>   int a;
>   octave_int32 b = 0;
>   a = b;
> }
> 
> compile with `g++ -DHAVE_CONFIG_H -I. -I../ -I ../libcruft/misc/ -c test.cc'
> 
> In any case, I'm sure it's desirable for any octave_int32<T> instance
> to be unambiguously convertible to default int and to octave_idx_type.
> So if you confirm this, then unless anyone objects, I'll make a patch
> to include the explicit conversions in octave_int32.


Tatsu at Inspiron6000 ~/octaves/octave-3.1.51/liboctave
$ g++ -DHAVE_CONFIG_H -I. -I../ -I ../libcruft/misc/ -c test.cc
test.cc: In function `int main()':
test.cc:7: error: conversion from `octave_int32' to `int' is ambiguous
oct-inttypes.h:324: note: candidates are: octave_int<T>::operator T() const [with T = int32_t]
oct-inttypes.h:328: note:  octave_int<T>::operator double() const [with T = int32_t]
oct-inttypes.h:330: note:  octave_int<T>::operator float() const [with T = int32_t]
test.cc:8:2: warning: no newline at end of file  

Perhaps your idea is right.  If you will make a patch for gcc-3.4.4 on cygwin, it will be helpful 
for cygwin people.

Regards

Tatsuro



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