Check QVariant type

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Check QVariant type

June 22, 2011

Luca

Ant Farmer
589 posts

Hi all,
I initialize a QVariant this way:

float my_float;
my_float = 12.2;
QVariant my_variant;
...
...
my_variant = QVariant(my_float);
...
...

now I need to be sure it’s a float and not a double or an int.
QVariant::Type doesn’t have “float” but I actually check the type this way:

if(my_variant.type() == QMetaType::Float)
{
}

this seems to works but I get a warning while compiling:

warning: comparison between 'enum QVariant::Type' and 'enum QMetaType::Type'

Is this the right way to check the QVariant type?

3 replies

June 22, 2011

loladiro

Lab Rat
596 posts

After reading the sources:

QVariant(float f) { d.is_null = false; d.type = QMetaType::Float; d.data.f = f; }

Yes it is! Although you could use int QVariant::userType() if you feel more comfortable comparing to an int.

June 22, 2011

Andre

Area 51 Engineer
6031 posts

Note that in Qt 5, the distinction between QVariant::Type and QMetaType::Type will most likely go away.

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June 22, 2011

Luca

Ant Farmer
589 posts

loladiro wrote:
After reading the sources:
QVariant(float f) { d.is_null = false; d.type = QMetaType::Float; d.data.f = f; }

Yes it is! Although you could use int QVariant::userType() if you feel more comfortable comparing to an int.

Thanks.

Andre wrote:
Note that in Qt 5, the distinction between QVariant::Type and QMetaType::Type will most likely go away.

That’s a good news…

‹‹ Associate All Application Resizing ››

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June 22, 2011