This may be a simple problem but this is my first use of cmake and first complicated build so I don't know what to try next. My current experience is Python and Java. I have searched Stackoverflow and OpenCV but did not find an answer that I understood enough to solve this problem.
I am trying to build a version of OpenCV on Windows with the non-free code included following this excellent tutorial https://cv-tricks.com/how-to/installation-of-opencv-4-1-0-in-windows-10-from-source/
I get the following 2 errors in compiling the supplied modules when creating opencv_cvv, there are also multiple warnings.
Line 1527: 59>C:\path\cvv\src\qtutil../util/observer_ptr.hpp(177,15): error C2039: 'logic_error': is not a member of 'std' (compiling source file C:\path\cvv\src\qtutil\collapsable.cpp)
Line 1532: 59>C:\path\cvv\src\qtutil../util/observer_ptr.hpp(177,1): error C2065: 'logic_error': undeclared identifier (compiling source file C:\path\cvv\src\qtutil\collapsable.cpp)
Development steps
Using Visual Studio 2019 and cmake to build, both installed on 22 May 20.
Downloaded OpenCV 4.3.0 and the OpenCV_contrib code on 22 May 20 following the instructions exactly as the tutorial says with one exception, I selected
OPENCV_ENABLE_NONFREE
To eliminate the OpenCV_contrib code, and build issues I built succesfully using the tutorial without selecting NONFREE or supplying the path to the extra modules. So the installation and build seem OK.
OpenCV collapsable.cpp
#include "collapsable.hpp"
namespace cvv
{
namespace qtutil
{
Collapsable::Collapsable(const QString &title, std::unique_ptr<QWidget> widget,
bool isCollapsed, QWidget *parent)
: QFrame{ parent }, widget_{ widget.get() }, layout_{ nullptr }
{
auto lay = util::make_unique<QVBoxLayout>();
layout_ = *lay;
// set alignment+border
setLineWidth(1);
setFrameStyle(QFrame::Box);
layout_->setAlignment(Qt::AlignTop);
layout_->setContentsMargins(0, 0, 0, 0);
// build header
auto tmpButton = util::make_unique<QPushButton>();
button_ = tmpButton.get();
button_->setEnabled(true);
button_->setText(title);
button_->setCheckable(true);
// build widget
setLayout(lay.release());
layout_->addWidget(tmpButton.release());
layout_->addWidget(widget.release());
// connect signals and slots
QObject::connect(button_, SIGNAL(clicked()), this,
SLOT(toggleVisibility()));
// collapse/ expand according to isCollapsed
collapse(isCollapsed);
}
// Collapsable::Collapsable(const QString& title,QWidget& widget, bool
// isCollapsed, QWidget *parent):
// Collapsable{title, std::unique_ptr<QWidget>{&widget}, isCollapsed,
//parent} {}
void Collapsable::collapse(bool b)
{
button_->setChecked(!b);
if (b)
{
widget_->hide();
}
else
{
widget_->show();
}
}
QWidget *Collapsable::detachWidget()
{
if (!widget_)
{
return nullptr;
}
layout_->removeWidget(widget_);
QWidget *tmp = widget_;
widget_ = nullptr;
return tmp;
}
}
} // end namespaces qtutil, cvv
OpenCV collapsable.hpp
#ifndef CVVISUAL_COLLAPSABLE_H
#define CVVISUAL_COLLAPSABLE_H
// std
#include <cstddef>
// QT
#include <QString>
#include <QWidget>
#include <QPushButton>
#include <QVBoxLayout>
#include <QLabel>
#include <QFrame>
#include "../util/util.hpp"
#include "../util/observer_ptr.hpp"
namespace cvv
{
namespace qtutil
{
/**
* @brief Contains a widget and a title.
*
* The widget can be collapsed and expanded with a button.
* If the widget is collapsed only button and title are shown.
*/
class Collapsable : public QFrame
{
Q_OBJECT
public:
/**
* @brief Constructs a collapsable
* @param title The title above the widget.
* @param widget The widget to store.
* @param isCollapsed If true the contained widget will be collapsed.
* (It will be shown
* otherwise.)
*/
// explicit Collapsable(const QString& title, QWidget& widget, bool
// isCollapsed = true,
// QWidget *parent = 0);
explicit Collapsable(const QString &title,
std::unique_ptr<QWidget> widget,
bool isCollapsed = true, QWidget *parent = 0);
~Collapsable()
{
}
/**
* @brief Collapses the contained widget.
* @param b
* @parblock
* true: collapses the widget
* false: expands the widget
* @endparblock
*/
void collapse(bool b = true);
/**
* @brief Expands the contained widget.
* @param b
* @parblock
* true: expands the widget
* false: collapses the widget
* @endparblock
*/
void expand(bool b = true)
{
collapse(!b);
}
/**
* @brief Sets the title above the widget.
*/
void setTitle(const QString &title)
{
button_->setText(title);
}
/**
* @brief Returns the current title above the widget.
* @return The current title above the widget
*/
QString title() const
{
return button_->text();
}
/**
* @brief Returns a reference to the contained widget.
* @return A reference to the contained widget.
*/
QWidget &widget()
{
return *widget_;
}
const QWidget &widget() const
{
return *widget_;
}
/**
* @brief Detaches the contained widget. (ownership remains)
* @return The contained widget
*/
QWidget *detachWidget();
private
slots:
/**
* @brief Toggles the visibility.
*/
void toggleVisibility()
{
collapse(widget_->isVisible());
}
private:
/**
* @brief The contained widget
*/
QWidget *widget_;
/**
* @brief The button to toggle the widget
*/
QPushButton *button_;
/**
* @brief The layout containing the header and widget
*/
util::ObserverPtr<QVBoxLayout> layout_;
}; // Collapsable
}
} // end namespaces qtutil, cvv
#endif // CVVISUAL_COLLAPSABLE_H
../util/observer_ptr.hpp. It likely is missing a#include <stdexcept>, because that is wherestd::logic_erroris declared according to the standard. – Cris Luengo