Details
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Suggestion
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Resolution: Won't Do
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Not Evaluated
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None
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None
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None
Description
The registerConverter function fails when I am trying extend the core conversion(s).
The fail is caused by the static assert. Commit: f7b313e6d86
"QMetaType::registerConverter: At least one of the types must be a custom type."
My proposal:
Allow to extend the conversions.
Pre-check before registration with: QMetaType::hasRegisteredConverterFunction
// member function as in "QString QFont::toString() const"
template<typename From, typename To>
static bool registerConverter(To(From::*function)() const)
{
bool registerConverterResult = false;
const int fromTypeId = qMetaTypeId<From>();
const int toTypeId = qMetaTypeId<To>();
const bool hasRegisteredConverterFunction = QMetaType::hasRegisteredConverterFunction(fromTypeId, toTypeId);
if (hasRegisteredConverterFunction == true)
{
static const QtPrivate::ConverterMemberFunction<From, To> f(function);
registerConverterResult = QMetaType::registerConverterFunction(&f, fromTypeId, toTypeId);
}
return registerConverterResult;
}
// member function as in "double QString::toDouble(bool *ok = nullptr) const"
template<typename From, typename To>
static bool registerConverter(To(From::*function)(bool*) const)
{
bool registerConverterResult = false;
const int fromTypeId = qMetaTypeId<From>();
const int toTypeId = qMetaTypeId<To>();
const bool hasRegisteredConverterFunction = QMetaType::hasRegisteredConverterFunction(fromTypeId, toTypeId);
if (hasRegisteredConverterFunction == true)
{
static const QtPrivate::ConverterMemberFunction<From, To> f(function);
registerConverterResult = QMetaType::registerConverterFunction(&f, fromTypeId, toTypeId);
}
return registerConverterResult;
}
// functor or function pointer
template<typename From, typename To, typename UnaryFunction>
static bool registerConverter(UnaryFunction function)
{
bool registerConverterResult = false;
const int fromTypeId = qMetaTypeId<From>();
const int toTypeId = qMetaTypeId<To>();
const bool hasRegisteredConverterFunction = QMetaType::hasRegisteredConverterFunction(fromTypeId, toTypeId);
if (hasRegisteredConverterFunction == true)
{
static const QtPrivate::ConverterFunctor<From, To, UnaryFunction> f(function);
registerConverterResult = QMetaType::registerConverterFunction(&f, fromTypeId, toTypeId);
}
return registerConverterResult;
}
My conversion were the following ones:
QString -> QBitArray
QBitArray -> QString
OR
QByteArray-> QBitArray
QBitArray -> QByteArray