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  1. Qt
  2. QTBUG-75776

QVariant canConvert: true / convert: false

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    • Icon: Bug Bug
    • Resolution: Invalid
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    • None
    • 5.12.3
    • Core: Other
    • None
    • Windows

      When I convert a string to a user defined enum, I found out that canConvert returns true for invalid strings, but convert returns false.

      I expect that canConvert should return false aswell.

      Here is my example: 

      // testenum.h

#ifndef TESTENUM_H
#define TESTENUM_H

#include <QObject>

namespace test {
    Q_NAMESPACE

    enum class TestEnum
    {
        ENUM_VALUE_1 = 10,
        ENUM_VALUE_2 = 20,
        ENUM_VALUE_3 = 30
    };
    Q_ENUM_NS(TestEnum)
}

#endif // TESTENUM_H

      // main.cpp

#include <QDebug>
#include <QVariant>

#include "testenum.h"

int main()
{
    bool convert = QVariant("ABC").convert(qMetaTypeId<test::TestEnum>());
    bool canConvert1 = QVariant("ABC").canConvert<test::TestEnum>();
    bool canConvert2 = QVariant("ABC").canConvert(qMetaTypeId<test::TestEnum>());

    qInfo() << "convert:"
            << convert
            << "canConvert1:"
            << canConvert1
            << "canConvert2:"
            << canConvert2;
}

      The output is:

      convert: false canConvert1: true canConvert2: true

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            thiago Thiago Macieira
            toms toms
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              Created:
              Updated:
              Resolved:

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