There is an example of using QML_ELEMENT in qt5\qtdeclarative\examples\quick\scenegraph\openglunderqml and qt_add_qml_module in CMake:
qt_add_qml_module(openglunderqml
URI OpenGLUnderQML
VERSION 1.0
QML_FILES main.qml
RESOURCE_PREFIX /scenegraph/openglunderqml
NO_RESOURCE_TARGET_PATH
)
In QML it imports the module:
import OpenGLUnderQML 1.0
I cloned QT repository:
git clone --recursive https://code.qt.io/qt/qt5.git --branch v6.2.0
cd qt5
Looks like the command below is not required:
./init-repository --module-subset=all
because it prints:
Will not reinitialize already initialized repository (use -f to force)!
Looks like QtPurchasing uses deprecated AIDL billing library and people say that it crashes on some devices. See https://developer.android.com/google/play/billing/deprecation-faq for more information. Probably they are going to update it in 5.15.7 and move it into examples in QT 6, so it is not clear exactly what will happen with it, we probably better wait QT 5.15.7 to be released.
(more…)Put the header content into a text file and load it into a variable:
cd ~/temp/
nano h.txt
h=$(<h.txt)
In C++20 we can do this:
#include <ranges>
#include <vector>
template <std::ranges::range Range>
requires std::same_as<std::ranges::range_value_t<Range>, int>
auto TransformIt(Range r)
{
return r | std::views::transform([](int n) { return n * n; });
}
int main()
{
std::vector<int> v;
auto r = TransformIt(v);
return 0;
}
The program below is terminated when the deleter throws the exception:
#include <iostream>
#include <memory>
struct X
{
int value;
};
struct Deleter
{
void operator()(X* p) noexcept(false)
{
if (p->value == 0)
{
throw std::logic_error("Can't delete a zero.");
}
delete p;
}
};
In QT 5.15 I declare a class with an invokable constructor:
class TestClass : public QObject
{
Q_OBJECT
public:
Q_INVOKABLE TestClass(QString val) {}
};
Q_DECLARE_METATYPE(TestClass*)
register its type:
qRegisterMetaType<TestClass*>();
std::unordered_set has a template find function in C++20. To make it work I define a custom hash and a custom equality compares as follows:
struct BotSettings
{
std::string type;
std::string name;
bool started;
};
I used a simple algorithm a got an interesting effect: the bot often buys at the peaks of the falling price. Below I provided some examples of buying the cryptocurrency on Binance crypto exchange:
DASH/USDT:
