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*>(&(ostringstream() <<
pAct.minArea))->str();
There's nothing wrong with this code, provided that:
* <sstream> 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<char, std::__1::char_traits<char>,
std::__1::allocator<char> >'
String inf = static_cast<ostringstream*>(&(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<char, std::__1::char_traits<char>,
std::__1::allocator<char> >'
String sup = static_cast<ostringstream*>(&(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<char, std::__1::char_traits<char>,
std::__1::allocator<char> >'
inf = static_cast<ostringstream*>(&(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<char, std::__1::char_traits<char>,
std::__1::allocator<char> >'
inf = static_cast<ostringstream*>(&(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<char, std::__1::char_traits<char>,
std::__1::allocator<char> >'
inf = static_cast<ostringstream*>(&(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<char, std::__1::char_traits<char>,
std::__1::allocator<char> >'
inf = static_cast<ostringstream*>(&(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<char, std::__1::char_traits<char>,
std::__1::allocator<char> >'
inf = static_cast<ostringstream*>(&(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<char, std::__1::char_traits<char>,
std::__1::allocator<char> >'
inf = static_cast<ostringstream*>(&(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<char, std::__1::char_traits<char>,
std::__1::allocator<char> >'
inf = static_cast<ostringstream*>(&(ostringstream() <<
(int)pAct.minMargin))->str();
^
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/ports/graphics/opencv3/work/opencv-3.1.0/samples/cpp/detect_mser.cpp:94:39:
error: cannot take the address of an rvalue of type
'std::__1::basic_ostringstream<char, std::__1::char_traits<char>,
std::__1::allocator<char> >'
inf = static_cast<ostringstream*>(&(ostringstream() <<
(int)pAct.edgeBlurSize))->str();
^
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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