why there still generates warning?

[asdf]

for (int k=static_cast<int>(box_.min_z());
k<=static_cast<int>(box_.max_z()); k++)

warning: converting
to `int' from `double'


thanks.

 

[Thomas Tutone]

for (int k=static_cast<int>(box_.min_z());
k<=static_cast<int>(box_.max_z()); k++)

warning: converting
to `int' from `double'

This is in the FAQ:

http://www.parashift.com/c++-faq-lite/how-to-post.html#faq-5.8

Good luck.

Best regards,

Tom

 

[Howard]

for (int k=static_cast<int>(box_.min_z());
k<=static_cast<int>(box_.max_z()); k++)

warning: converting
to `int' from `double'

I don't see anything converting from int to double there. I don't even see
anything that's a double, unless it's the return value of max_z() or
min_z(). But you're casting those TO int, not from int to double.

Perhaps the warning is on a different (but nearby) line of code?

-Howard

 

[Frederick Gotham]

asdf posted:

warning: converting
to `int' from `double'

There's a few things you can try to supress the warning.

int i = (int)56.33;

int i = static_cast<int>(56.33);

int i = reinterpret_cast<int>(56.33);

(I'm not 100% sure if you can use reinterpret_cast for this purpose... ?)

 

[Howard]

I don't see anything converting from int to double there. I don't even
see anything that's a double, unless it's the return value of max_z() or
min_z(). But you're casting those TO int, not from int to double.

My mistake. I misread. (It's wierd to phrase it like that, don't you
think... "to int from double"? Most people speak the opposite way: "from A
to B".)

Never mind.

-Howard

 

[Howard]

asdf posted:



There's a few things you can try to supress the warning.

int i = (int)56.33;

int i = static_cast<int>(56.33);

That's exactly what the OP tried. (See the code you snipped.) And he still
got the warning. Which I'm assuming is why the subject line was "why there
STILL generates warning?" [emphasis added]

If I substitute my own double values for those min and max functions, I
don't get any such warning. I'm still wondering if the warning isn't on a
different, nearby line of code.

-Howard

 

[Andrey Tarasevich]

...
int i = reinterpret_cast<int>(56.33);

(I'm not 100% sure if you can use reinterpret_cast for this purpose... ?)
...

No, it can't be used for this purpose. 'reinterpret_cast' is limited to
pointer<->pointer, reference<->reference and pointer<->integer conversions.

 

[Diego Martins]

No, it can't be used for this purpose. 'reinterpret_cast' is limited to
pointer<->pointer, reference<->reference and pointer<->integer conversions.

are you sure? I thought reinterpret_cast<> can be used in any way, but
the user must face its implementation defined consequences

 

[Andrey Tarasevich]

are you sure? I thought reinterpret_cast<> can be used in any way, but
the user must face its implementation defined consequences
...

No, it can't be. 5.2.10/1 clearly lists the kinds of conversions that can be
performed with 'reinterpret_cast' and states that "no other conversion can be
performed" using it.