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QLocale: improve documentation snippet 

QString::toDouble() now always uses C locale, so the previous code
snippet does not make much sense, as the results do not depend on the
selected default locale.
The updated snippet uses the default locale, which allows to show the
difference between locales.

Pick-to: 6.2
Change-Id: I76a00429fa5b75cf109cf45bc25280a7fd427e0f
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
bb10
Ivan Solovev 2021-08-26 10:42:43 +02:00
parent 8585cd2483
commit 7729989648
1 changed files with 11 additions and 9 deletions
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20
src/corelib/doc/snippets/code/src_corelib_text_qlocale.cpp
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@ -62,17 +62,19 @@ int i = egyptian.toInt(s2);
bool ok;
double d;
QLocale::setDefault(QLocale::C);
d = QString("1234,56").toDouble(&ok); // ok == false, d == 0
d = QString("1234.56").toDouble(&ok); // ok == true, d == 1234.56
QLocale::setDefault(QLocale::C); // uses '.' as a decimal point
QLocale cLocale; // default-constructed C locale
d = cLocale.toDouble("1234,56", &ok); // ok == false, d == 0
d = cLocale.toDouble("1234.56", &ok); // ok == true, d == 1234.56
QLocale::setDefault(QLocale::German);
d = QString("1234,56").toDouble(&ok); // ok == false, d == 0
d = QString("1234.56").toDouble(&ok); // ok == true, d == 1234.56
QLocale::setDefault(QLocale::German); // uses ',' as a decimal point
QLocale german; // default-constructed German locale
d = german.toDouble("1234,56", &ok); // ok == true, d == 1234.56
d = german.toDouble("1234.56", &ok); // ok == false, d == 0
QLocale::setDefault(QLocale(QLocale::English, QLocale::UnitedStates));
QString str = QString("%1 %L2 %L3")
.arg(12345).arg(12345).arg(12345, 0, 16);
QLocale::setDefault(QLocale::English);
// Default locale now uses ',' as a group separator.
QString str = QString("%1 %L2 %L3").arg(12345).arg(12345).arg(12345, 0, 16);
// str == "12345 12,345 3039"
//! [1]