Re: How compile "String inf = static_cast<ostringstream*>(&(ostringstream() << pAct.minArea))->str();"

[Pietro Cerutti]

On 2016-11-14 14:39, Otacílio wrote:

Em 14/11/2016 06:29, Pietro Cerutti escreveu:

On 2016-11-09 02:37, Otacílio wrote:

I'm trying create a patch to OpenCV 3.1 runs on FreeBSD but clang
don't compiles lines like this:

String inf = static_cast(&(ostringstream() <<
pAct.minArea))->str();


There's nothing wrong with this code, provided that:

*  is included
* ostringstream is actually std::ostringstream
* pAct.minArea defines operator<< to std::ostringstream or one of its 
base classes


What's the error you're getting?

That being said, I'd switch to using c++11 and String inf = 
std::to_string(pAct.minArea) :)




Hi

This code is in
/usr/ports/graphics/opencv3/work/opencv-3.1.0/samples/cpp/detect_mser.cpp
line 76 . I'm using C++11. The full compiler error message is this:


[ 95%] Built target example_image_sequence
--- samples/cpp/CMakeFiles/example_select3dobj.dir/all ---
/usr/bin/make -f
samples/cpp/CMakeFiles/example_select3dobj.dir/build.make
samples/cpp/CMakeFiles/example_select3dobj.dir/depend
--- samples/cpp/CMakeFiles/example_select3dobj.dir/depend ---
cd /usr/ports/graphics/opencv3/work/opencv-3.1.0 &&
/usr/local/bin/cmake -E cmake_depends "Unix Makefiles"
/usr/ports/graphics/opencv3/work/opencv-3.1.0
/usr/ports/graphics/opencv3/work/opencv-3.1.0/samples/cpp
/usr/ports/graphics/opencv3/work/opencv-3.1.0
/usr/ports/graphics/opencv3/work/opencv-3.1.0/samples/cpp
/usr/ports/graphics/opencv3/work/opencv-3.1.0/samples/cpp/CMakeFiles/example_select3dobj.dir/DependInfo.cmake
--color=
--- samples/cpp/CMakeFiles/example_detect_mser.dir/all ---
/usr/ports/graphics/opencv3/work/opencv-3.1.0/samples/cpp/detect_mser.cpp:76:46:
error: cannot take the address of an rvalue of type
'std::__1::basic_ostringstream'
String inf = static_cast(&(ostringstream() <<
pAct.minArea))->str();
 ^ 
~~~


oh, of course :) you could force runtime polymorphism by turning the 
temporary into a reference, like this:


 String inf = static_cast(ostringstream() << 
pAct.minArea).str()



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Re: How compile "String inf = static_cast<ostringstream*>(&(ostringstream() << pAct.minArea))->str();"

[Otacílio]

Em 14/11/2016 06:29, Pietro Cerutti escreveu:

On 2016-11-09 02:37, Otacílio wrote:

I'm trying create a patch to OpenCV 3.1 runs on FreeBSD but clang
don't compiles lines like this:

String inf = static_cast(&(ostringstream() <<
pAct.minArea))->str();


There's nothing wrong with this code, provided that:

*  is included
* ostringstream is actually std::ostringstream
* pAct.minArea defines operator<< to std::ostringstream or one of its 
base classes


What's the error you're getting?

That being said, I'd switch to using c++11 and String inf = 
std::to_string(pAct.minArea) :)



I'm using your suggestion and it works fine. Thanks a lot!


[]'s

-Otacilio

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Re: How compile "String inf = static_cast<ostringstream*>(&(ostringstream() << pAct.minArea))->str();"

[Otacílio]

Em 14/11/2016 06:29, Pietro Cerutti escreveu:

On 2016-11-09 02:37, Otacílio wrote:

I'm trying create a patch to OpenCV 3.1 runs on FreeBSD but clang
don't compiles lines like this:

String inf = static_cast(&(ostringstream() <<
pAct.minArea))->str();


There's nothing wrong with this code, provided that:

*  is included
* ostringstream is actually std::ostringstream
* pAct.minArea defines operator<< to std::ostringstream or one of its 
base classes


What's the error you're getting?

That being said, I'd switch to using c++11 and String inf = 
std::to_string(pAct.minArea) :)




Hi

This code is in 
/usr/ports/graphics/opencv3/work/opencv-3.1.0/samples/cpp/detect_mser.cpp 
line 76 . I'm using C++11. The full compiler error message is this:



[ 95%] Built target example_image_sequence
--- samples/cpp/CMakeFiles/example_select3dobj.dir/all ---
/usr/bin/make -f 
samples/cpp/CMakeFiles/example_select3dobj.dir/build.make 
samples/cpp/CMakeFiles/example_select3dobj.dir/depend

--- samples/cpp/CMakeFiles/example_select3dobj.dir/depend ---
cd /usr/ports/graphics/opencv3/work/opencv-3.1.0 && /usr/local/bin/cmake 
-E cmake_depends "Unix Makefiles" 
/usr/ports/graphics/opencv3/work/opencv-3.1.0 
/usr/ports/graphics/opencv3/work/opencv-3.1.0/samples/cpp 
/usr/ports/graphics/opencv3/work/opencv-3.1.0 
/usr/ports/graphics/opencv3/work/opencv-3.1.0/samples/cpp 
/usr/ports/graphics/opencv3/work/opencv-3.1.0/samples/cpp/CMakeFiles/example_select3dobj.dir/DependInfo.cmake 
--color=

--- samples/cpp/CMakeFiles/example_detect_mser.dir/all ---
/usr/ports/graphics/opencv3/work/opencv-3.1.0/samples/cpp/detect_mser.cpp:76:46: 
error: cannot take the address of an rvalue of type 
'std::__1::basic_ostringstream'
String inf = static_cast(&(ostringstream() << 
pAct.minArea))->str();
 ^ 
~~~
/usr/ports/graphics/opencv3/work/opencv-3.1.0/samples/cpp/detect_mser.cpp:77:46: 
error: cannot take the address of an rvalue of type 
'std::__1::basic_ostringstream'
String sup = static_cast(&(ostringstream() << 
pAct.maxArea))->str();
 ^ 
~~~
/usr/ports/graphics/opencv3/work/opencv-3.1.0/samples/cpp/detect_mser.cpp:80:39: 
error: cannot take the address of an rvalue of type 
'std::__1::basic_ostringstream'
inf = static_cast(&(ostringstream() << 
pAct.delta))->str();

  ^ ~
/usr/ports/graphics/opencv3/work/opencv-3.1.0/samples/cpp/detect_mser.cpp:82:39: 
error: cannot take the address of an rvalue of type 
'std::__1::basic_ostringstream'
inf = static_cast(&(ostringstream() << 
pAct.maxVariation))->str();
  ^ 

/usr/ports/graphics/opencv3/work/opencv-3.1.0/samples/cpp/detect_mser.cpp:84:39: 
error: cannot take the address of an rvalue of type 
'std::__1::basic_ostringstream'
inf = static_cast(&(ostringstream() << 
(int)pAct.minDiversity))->str();
  ^ 
~
/usr/ports/graphics/opencv3/work/opencv-3.1.0/samples/cpp/detect_mser.cpp:86:39: 
error: cannot take the address of an rvalue of type 
'std::__1::basic_ostringstream'
inf = static_cast(&(ostringstream() << 
(int)pAct.pass2Only))->str();
  ^ 
~~
/usr/ports/graphics/opencv3/work/opencv-3.1.0/samples/cpp/detect_mser.cpp:88:39: 
error: cannot take the address of an rvalue of type 
'std::__1::basic_ostringstream'
inf = static_cast(&(ostringstream() << 
(int)pAct.maxEvolution))->str();
  ^ 
~
/usr/ports/graphics/opencv3/work/opencv-3.1.0/samples/cpp/detect_mser.cpp:90:39: 
error: cannot take the address of an rvalue of type 
'std::__1::basic_ostringstream'
inf = static_cast(&(ostringstream() << 
(int)pAct.areaThreshold))->str();
  ^ 
~~
/usr/ports/graphics/opencv3/work/opencv-3.1.0/samples/cpp/detect_mser.cpp:92:39: 
error: cannot take the address of an rvalue of type 
'std::__1::basic_ostringstream'
inf = static_cast(&(ostringstream() << 
(int)pAct.minMargin))->str();
   

Re: How compile "String inf = static_cast<ostringstream*>(&(ostringstream() << pAct.minArea))->str();"

[Pietro Cerutti]

On 2016-11-09 02:37, Otacílio wrote:

I'm trying create a patch to OpenCV 3.1 runs on FreeBSD but clang
don't compiles lines like this:

String inf = static_cast(&(ostringstream() <<
pAct.minArea))->str();


There's nothing wrong with this code, provided that:

*  is included
* ostringstream is actually std::ostringstream
* pAct.minArea defines operator<< to std::ostringstream or one of its 
base classes


What's the error you're getting?

That being said, I'd switch to using c++11 and String inf = 
std::to_string(pAct.minArea) :)


--
Pietro Cerutti
g...@freebsd.org

PGP Public Key:
http://gahr.ch/pgp
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Re: How compile "String inf = static_cast<ostringstream*>(&(ostringstream() << pAct.minArea))->str();"

[Patrick Hess]

On 09.11.2016 02:37, Otacílio wrote:

I'm trying create a patch to OpenCV 3.1 runs on FreeBSD but clang don't 
compiles lines like this:

String inf = static_cast(&(ostringstream() << 
pAct.minArea))->str();


You need to provide us with the *exact* error message from clang.

By the way, that line is the text-book definition of code horror,
but that's a different story.

Patrick

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How compile "String inf = static_cast<ostringstream*>(&(ostringstream() << pAct.minArea))->str();"

[Otacílio]

I'm trying create a patch to OpenCV 3.1 runs on FreeBSD but clang don't 
compiles lines like this:


String inf = static_cast(&(ostringstream() << 
pAct.minArea))->str();


Can someone give me a hint about how to fix it?


[]'s

-Otacilio

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