QLatin1StringView Class

if (str == "auto" || str == "extern"
        || str == "static" || str == "register") {
    ...
}

if (str == QString("auto") || str == QString("extern")
        || str == QString("static") || str == QString("register")) {
    ...
}

str.append("Hello ").append("World");

if (str == "auto"_L1
        || str == "extern"_L1
        || str == "static"_L1
        || str == "register"_L1 {
    ...
}

QLabel *label = new QLabel("MOD"_L1, this);

Member Function Documentation

[since 6.0] template <typename Needle, typename Flags> decltype(qTokenize(*this, std::forward<Needle>(needle), flags...)) QLatin1StringView::tokenize(Needle &&sep, Flags... flags) const

Splits the string into substring views wherever sep occurs, and returns a lazy sequence of those strings.

Equivalent to

return QStringTokenizer{std::forward<Needle>(sep), flags...};

except it works without C++17 Class Template Argument Deduction (CTAD) enabled in the compiler.

See QStringTokenizer for how sep and flags interact to form the result.

QStringTokenizer result = sv.tokenize(sep);

(without template arguments). If you can't use C++17 CTAD, you must store the return value only in auto variables:

auto result = sv.tokenize(sep);

This is because the template arguments of QStringTokenizer have a very subtle dependency on the specific tokenize() overload from which they are returned, and they don't usually correspond to the type used for the separator.

This function was introduced in Qt 6.0.

See also QStringTokenizer and qTokenize().

[since 5.14] template <typename Args> QString QLatin1StringView::arg(Args &&... args) const

Replaces occurrences of %N in this string with the corresponding argument from args. The arguments are not positional: the first of the args replaces the %N with the lowest N (all of them), the second of the args the %N with the next-lowest N etc.

Args can consist of anything that implicitly converts to QString, QStringView or QLatin1StringView.

In addition, the following types are also supported: QChar, QLatin1Char.

This function was introduced in Qt 5.14.

See also QString::arg().

Returns this QLatin1StringView converted to a corresponding floating-point value.

Returns an infinity if the conversion overflows or 0.0 if the conversion fails for other reasons (e.g. underflow).

If ok is not nullptr, failure is reported by setting *ok to false, and success by setting *ok to true.

This function ignores leading and trailing spacing characters.

This function was introduced in Qt 6.4.

Returns this QLatin1StringView converted to a corresponding numeric value using base base, which is ten by default. Bases 0 and 2 through 36 are supported, using letters for digits beyond 9; A is ten, B is eleven and so on.

If base is 0, the base is determined automatically using the following rules: if the Latin-1 string begins with "0x", the rest of it is read as hexadecimal (base 16); otherwise, if it begins with "0b", the rest of it is read as binary (base 2); otherwise, if it begins with "0", the rest of it is read as octal (base 8); otherwise it is read as decimal.

Returns 0 if the conversion fails.

If ok is not nullptr, failure is reported by setting *ok to false, and success by setting *ok to true.

This function ignores leading and trailing spacing characters.

This function was introduced in Qt 6.4.

Returns the number of (potentially overlapping) occurrences of the string-view str, Latin-1 string l1, or character ch, respectively, in this Latin-1 string.

If cs is Qt::CaseSensitive (default), the search is case sensitive; otherwise the search is case insensitive.

This function was introduced in Qt 6.4.

See also contains() and indexOf().

This function overloads lastIndexOf().

Returns the index position of the last occurrence of the string-view str or Latin-1 string l1, respectively, in this Latin-1 string. Returns -1 if str is not found.

If cs is Qt::CaseSensitive (default), the search is case sensitive; otherwise the search is case insensitive.

This function was introduced in Qt 6.2.

Returns the index position of the last occurrence of the string-view str, Latin-1 string l1, or character ch, respectively, in this Latin-1 string, searching backward from index position from. Returns -1 if str is not found.

If from is -1, the search starts at the last character; if from is -2, at the next to last character and so on.

If cs is Qt::CaseSensitive (default), the search is case sensitive; otherwise the search is case insensitive.

This function was introduced in Qt 5.14.

See also indexOf(), QStringView::lastIndexOf(), QStringView::indexOf(), and QString::indexOf().

Returns true if this Latin-1 string contains an occurrence of the string-view str, Latin-1 string l1, or character ch; otherwise returns false.

If cs is Qt::CaseSensitive (the default), the search is case-sensitive; otherwise the search is case-insensitive.

This function was introduced in Qt 5.14.

See also indexOf(), QStringView::contains(), QStringView::indexOf(), and QString::indexOf().

Returns the index position of the first occurrence of the string-view str, Latin-1 string l1, or character ch, respectively, in this Latin-1 string, searching forward from index position from. Returns -1 if str is not found.

If cs is Qt::CaseSensitive (default), the search is case sensitive; otherwise the search is case insensitive.

If from is -1, the search starts at the last character; if it is -2, at the next to last character and so on.

This function was introduced in Qt 5.14.

See also QString::indexOf().

Returns true if this Latin-1 string ends with string-view str, Latin-1 string l1, or character ch, respectively; otherwise returns false.

If cs is Qt::CaseSensitive (the default), the search is case-sensitive; otherwise the search is case-insensitive.

This function was introduced in Qt 5.10.

See also startsWith().

Returns true if this Latin-1 string starts with string-view str, Latin-1 string l1, or character ch, respectively; otherwise returns false.

If cs is Qt::CaseSensitive (the default), the search is case-sensitive; otherwise the search is case-insensitive.

This function was introduced in Qt 5.10.

See also endsWith().

Returns an integer that compares to zero as this Latin-1 string compares to the string-view str, Latin-1 string l1, or character ch, respectively.

If cs is Qt::CaseSensitive (the default), the comparison is case sensitive; otherwise the comparison is case-insensitive.

This function was introduced in Qt 5.14.

See also operator==(), operator<(), and operator>().

[since 6.3] QLatin1StringView::QLatin1StringView(QByteArrayView str)

Constructs a QLatin1StringView object that stores str.

The string data is not copied. The caller must be able to guarantee that the data which str is pointing to will not be deleted or modified as long as the QLatin1StringView object exists. The size is obtained from str as-is, without checking for a null-terminator.

This function was introduced in Qt 6.3.

See also latin1().

QLatin1StringView::QLatin1StringView(const QByteArray &str)

Constructs a QLatin1StringView object that stores str.

The string data is not copied. The caller must be able to guarantee that str will not be deleted or modified as long as the QLatin1StringView object exists.

See also latin1().

QLatin1StringView::QLatin1StringView(const char *str, qsizetype size)

Constructs a QLatin1StringView object that stores str with size.

The string data is not copied. The caller must be able to guarantee that str will not be deleted or modified as long as the QLatin1StringView object exists.

See also latin1().

[since 5.10] QLatin1StringView::QLatin1StringView(const char *first, const char *last)

Constructs a QLatin1StringView object that stores first with length (last - first).

The range [first,last) must remain valid for the lifetime of this Latin-1 string object.

Passing nullptr as first is safe if last is nullptr, too, and results in a null Latin-1 string.

The behavior is undefined if last precedes first, first is nullptr and last is not, or if last - first > INT_MAX.

This function was introduced in Qt 5.10.

QLatin1StringView::QLatin1StringView(const char *str)

Constructs a QLatin1StringView object that stores str.

The string data is not copied. The caller must be able to guarantee that str will not be deleted or modified as long as the QLatin1StringView object exists.

See also latin1().

[since 6.4] QLatin1StringView::QLatin1StringView(std::nullptr_t)

Constructs a QLatin1StringView object that stores a nullptr.

This function was introduced in Qt 6.4.

See also data(), isEmpty(), isNull(), and Distinction Between Null and Empty Strings.

[since 5.6] QLatin1StringView::QLatin1StringView()

Constructs a QLatin1StringView object that stores a nullptr.

This function was introduced in Qt 5.6.

See also data(), isEmpty(), isNull(), and Distinction Between Null and Empty Strings.

[since 5.8] QLatin1Char QLatin1StringView::at(qsizetype pos) const

Returns the character at position pos in this object.

This function was introduced in Qt 5.8.

See also operator[]().

[since 5.10] QLatin1Char QLatin1StringView::back() const

Returns the last character in the string. Same as at(size() - 1).

This function is provided for STL compatibility.

This function was introduced in Qt 5.10.

See also front(), at(), and operator[]().

[since 5.10] QLatin1StringView::const_iterator QLatin1StringView::begin() const

Returns a const STL-style iterator pointing to the first character in the string.

This function is provided for STL compatibility.

This function was introduced in Qt 5.10.

See also end(), cbegin(), rbegin(), and data().

[since 5.10] QLatin1StringView::const_iterator QLatin1StringView::cbegin() const

Same as begin().

This function is provided for STL compatibility.

This function was introduced in Qt 5.10.

See also cend(), begin(), crbegin(), and data().

[since 5.10] QLatin1StringView::const_iterator QLatin1StringView::cend() const

Same as end().

This function is provided for STL compatibility.

This function was introduced in Qt 5.10.

See also cbegin(), end(), and crend().

[since 5.10] void QLatin1StringView::chop(qsizetype length)

Truncates this string by length characters.

Same as *this = left(size() - length).

This function was introduced in Qt 5.10.

See also sliced(), first(), last(), chopped(), and truncate().

[since 5.10] QLatin1StringView QLatin1StringView::chopped(qsizetype length) const

Returns the substring of length size() - length starting at the beginning of this object.

Same as left(size() - length).

This function was introduced in Qt 5.10.

See also sliced(), first(), last(), chop(), and truncate().

[since 6.4] const char *QLatin1StringView::constBegin() const

Same as begin().

This function is provided for compatibility with other Qt containers.

This function was introduced in Qt 6.4.

See also constEnd(), begin(), cbegin(), and data().

[since 6.4] const char *QLatin1StringView::constData() const

Returns the start of the Latin-1 string referenced by this object.

This function is provided for compatibility with other Qt containers.

This function was introduced in Qt 6.4.

See also data().

[since 6.4] const char *QLatin1StringView::constEnd() const

Same as end().

This function is provided for compatibility with other Qt containers.

This function was introduced in Qt 6.4.

See also constBegin(), end(), cend(), and crend().

[since 5.10] QLatin1StringView::const_reverse_iterator QLatin1StringView::crbegin() const

Same as rbegin().

This function is provided for STL compatibility.

This function was introduced in Qt 5.10.

See also crend(), rbegin(), and cbegin().

[since 5.10] QLatin1StringView::const_reverse_iterator QLatin1StringView::crend() const

Same as rend().

This function is provided for STL compatibility.

This function was introduced in Qt 5.10.

See also crbegin(), rend(), and cend().

const char *QLatin1StringView::data() const

Returns the start of the Latin-1 string referenced by this object.

[since 6.4] bool QLatin1StringView::empty() const

Returns whether the Latin-1 string referenced by this object is empty (size() == 0) or not.

This function is provided for STL compatibility.

This function was introduced in Qt 6.4.

See also isEmpty(), isNull(), and size().

[since 5.10] QLatin1StringView::const_iterator QLatin1StringView::end() const

Returns a const STL-style iterator pointing just after the last character in the string.

This function is provided for STL compatibility.

This function was introduced in Qt 5.10.

See also begin(), cend(), and rend().

[since 6.4] QLatin1Char QLatin1StringView::first() const

Returns the first character in the string. Same as at(0) or front().

This function is provided for compatibility with other Qt containers.

This function was introduced in Qt 6.4.

See also last(), front(), and back().

[since 6.0] QLatin1StringView QLatin1StringView::first(qsizetype n) const

Returns a Latin-1 string that contains the first n characters of this Latin-1 string.

This function was introduced in Qt 6.0.

See also last(), startsWith(), chopped(), chop(), and truncate().

[since 5.10] QLatin1Char QLatin1StringView::front() const

Returns the first character in the string. Same as at(0).

This function is provided for STL compatibility.

This function was introduced in Qt 5.10.

See also back(), at(), and operator[]().

[since 5.10] bool QLatin1StringView::isEmpty() const

Returns whether the Latin-1 string referenced by this object is empty (size() == 0) or not.

This function was introduced in Qt 5.10.

See also isNull() and size().

[since 5.10] bool QLatin1StringView::isNull() const

Returns whether the Latin-1 string referenced by this object is null (data() == nullptr) or not.

This function was introduced in Qt 5.10.

See also isEmpty() and data().

[since 6.4] QLatin1Char QLatin1StringView::last() const

Returns the last character in the string. Same as at(size() - 1) or back().

This function is provided for compatibility with other Qt containers.

This function was introduced in Qt 6.4.

See also first(), back(), and front().

[since 6.0] QLatin1StringView QLatin1StringView::last(qsizetype n) const

Returns a Latin-1 string that contains the last n characters of this Latin-1 string.

This function was introduced in Qt 6.0.

See also first(), endsWith(), chopped(), chop(), and truncate().

[since 6.3] qsizetype QLatin1StringView::lastIndexOf(QChar ch, Qt::CaseSensitivity cs = Qt::CaseSensitive) const

This is an overloaded function.

This function was introduced in Qt 6.3.

const char *QLatin1StringView::latin1() const

Returns the start of the Latin-1 string referenced by this object.

[since 5.8] QLatin1StringView QLatin1StringView::left(qsizetype length) const

If you know that length cannot be out of bounds, use first() instead in new code, because it is faster.

Returns the substring of length length starting at position 0 in this Latin-1 string.

The entire Latin-1 string is returned if length is greater than or equal to size(), or less than zero.

This function was introduced in Qt 5.8.

See also first(), last(), sliced(), startsWith(), chopped(), chop(), and truncate().

[since 6.4] qsizetype QLatin1StringView::length() const

Same as size().

This function is provided for compatibility with other Qt containers.

This function was introduced in Qt 6.4.

[since 5.8] QLatin1StringView QLatin1StringView::mid(qsizetype start, qsizetype length = -1) const

Returns the substring of length length starting at position start in this Latin-1 string.

If you know that start and length cannot be out of bounds, use sliced() instead in new code, because it is faster.

Returns an empty Latin-1 string if start exceeds the length of this Latin-1 string. If there are less than length characters available in this Latin-1 string starting at start, or if length is negative (default), the function returns all characters that are available from start.

This function was introduced in Qt 5.8.

See also first(), last(), sliced(), chopped(), chop(), and truncate().

[since 5.10] QLatin1StringView::const_reverse_iterator QLatin1StringView::rbegin() const

Returns a const STL-style reverse iterator pointing to the first character in the string, in reverse order.

This function is provided for STL compatibility.

This function was introduced in Qt 5.10.

See also rend(), crbegin(), and begin().

[since 5.10] QLatin1StringView::const_reverse_iterator QLatin1StringView::rend() const

Returns a STL-style reverse iterator pointing just after the last character in the string, in reverse order.

This function is provided for STL compatibility.

This function was introduced in Qt 5.10.

See also rbegin(), crend(), and end().

[since 5.8] QLatin1StringView QLatin1StringView::right(qsizetype length) const

If you know that length cannot be out of bounds, use last() instead in new code, because it is faster.

Returns the substring of length length starting at position size() - length in this Latin-1 string.

The entire Latin-1 string is returned if length is greater than or equal to size(), or less than zero.

This function was introduced in Qt 5.8.

See also first(), last(), sliced(), endsWith(), chopped(), chop(), and truncate().

qsizetype QLatin1StringView::size() const

Returns the size of the Latin-1 string referenced by this object.

[since 6.0] QLatin1StringView QLatin1StringView::sliced(qsizetype pos) const

Returns a Latin-1 string starting at position pos in this Latin-1 string, and extending to its end.

This function was introduced in Qt 6.0.

See also first(), last(), chopped(), chop(), and truncate().

[since 6.0] QLatin1StringView QLatin1StringView::sliced(qsizetype pos, qsizetype n) const

Returns a Latin-1 string that points to n characters of this Latin-1 string, starting at position pos.

This function was introduced in Qt 6.0.

See also first(), last(), chopped(), chop(), and truncate().

[since 6.0] QString QLatin1StringView::toString() const

Converts this Latin-1 string into a QString. Equivalent to

return QString(*this);

This function was introduced in Qt 6.0.

[since 5.10] QLatin1StringView QLatin1StringView::trimmed() const

Strips leading and trailing whitespace and returns the result.

Whitespace means any character for which QChar::isSpace() returns true. This includes the ASCII characters '\t', '\n', '\v', '\f', '\r', and ' '.

This function was introduced in Qt 5.10.

[since 5.10] void QLatin1StringView::truncate(qsizetype length)

Truncates this string to length length.

Same as *this = left(length).

This function was introduced in Qt 5.10.

See also sliced(), first(), last(), chopped(), and chop().

bool QLatin1StringView::operator!=(const char *other) const

Returns true if this string is not equal to const char pointer other; otherwise returns false.

The other const char pointer is converted to a QString using the QString::fromUtf8() function.

You can disable this operator by defining QT_NO_CAST_FROM_ASCII when you compile your applications. This can be useful if you want to ensure that all user-visible strings go through QObject::tr(), for example.

See also Comparing Strings.

[since 5.0] bool QLatin1StringView::operator!=(const QByteArray &other) const

This function overloads operator!=().

The other byte array is converted to a QString using the QString::fromUtf8() function.

You can disable this operator by defining QT_NO_CAST_FROM_ASCII when you compile your applications. This can be useful if you want to ensure that all user-visible strings go through QObject::tr(), for example.

This function was introduced in Qt 5.0.

bool QLatin1StringView::operator<(const char *other) const

Returns true if this string is lexically less than const char pointer other; otherwise returns false.

The other const char pointer is converted to a QString using the QString::fromUtf8() function.

You can disable this operator by defining QT_NO_CAST_FROM_ASCII when you compile your applications. This can be useful if you want to ensure that all user-visible strings go through QObject::tr(), for example.

See also Comparing Strings.

[since 5.0] bool QLatin1StringView::operator<(const QByteArray &other) const

This is an overloaded function.

The other byte array is converted to a QString using the QString::fromUtf8() function.

You can disable this operator by defining QT_NO_CAST_FROM_ASCII when you compile your applications. This can be useful if you want to ensure that all user-visible strings go through QObject::tr(), for example.

This function was introduced in Qt 5.0.

bool QLatin1StringView::operator<=(const char *other) const

Returns true if this string is lexically less than or equal to const char pointer other; otherwise returns false.

The other const char pointer is converted to a QString using the QString::fromUtf8() function.

You can disable this operator by defining QT_NO_CAST_FROM_ASCII when you compile your applications. This can be useful if you want to ensure that all user-visible strings go through QObject::tr(), for example.

See also Comparing Strings.

[since 5.0] bool QLatin1StringView::operator<=(const QByteArray &other) const

This is an overloaded function.

The other byte array is converted to a QString using the QString::fromUtf8() function.

You can disable this operator by defining QT_NO_CAST_FROM_ASCII when you compile your applications. This can be useful if you want to ensure that all user-visible strings go through QObject::tr(), for example.

This function was introduced in Qt 5.0.

bool QLatin1StringView::operator==(const char *other) const

Returns true if the string is equal to const char pointer other; otherwise returns false.

The other const char pointer is converted to a QString using the QString::fromUtf8() function.

You can disable this operator by defining QT_NO_CAST_FROM_ASCII when you compile your applications. This can be useful if you want to ensure that all user-visible strings go through QObject::tr(), for example.

See also Comparing Strings.

[since 5.0] bool QLatin1StringView::operator==(const QByteArray &other) const

This is an overloaded function.

The other byte array is converted to a QString using the QString::fromUtf8() function.

You can disable this operator by defining QT_NO_CAST_FROM_ASCII when you compile your applications. This can be useful if you want to ensure that all user-visible strings go through QObject::tr(), for example.

This function was introduced in Qt 5.0.

bool QLatin1StringView::operator>(const char *other) const

Returns true if this string is lexically greater than const char pointer other; otherwise returns false.

The other const char pointer is converted to a QString using the QString::fromUtf8() function.

You can disable this operator by defining QT_NO_CAST_FROM_ASCII when you compile your applications. This can be useful if you want to ensure that all user-visible strings go through QObject::tr(), for example.

See also Comparing Strings.

[since 5.0] bool QLatin1StringView::operator>(const QByteArray &other) const

This is an overloaded function.

The other byte array is converted to a QString using the QString::fromUtf8() function.

You can disable this operator by defining QT_NO_CAST_FROM_ASCII when you compile your applications. This can be useful if you want to ensure that all user-visible strings go through QObject::tr(), for example.

This function was introduced in Qt 5.0.

bool QLatin1StringView::operator>=(const char *other) const

Returns true if this string is lexically greater than or equal to const char pointer other; otherwise returns false.

The other const char pointer is converted to a QString using the QString::fromUtf8() function.

You can disable this operator by defining QT_NO_CAST_FROM_ASCII when you compile your applications. This can be useful if you want to ensure that all user-visible strings go through QObject::tr(), for example.

See also Comparing Strings.

[since 5.0] bool QLatin1StringView::operator>=(const QByteArray &other) const

This is an overloaded function.

The other byte array is converted to a QString using the QString::fromUtf8() function.

You can disable this operator by defining QT_NO_CAST_FROM_ASCII when you compile your applications. This can be useful if you want to ensure that all user-visible strings go through QObject::tr(), for example.

This function was introduced in Qt 5.0.

[since 5.8] QLatin1Char QLatin1StringView::operator[](qsizetype pos) const

Returns the character at position pos in this object.

This function was introduced in Qt 5.8.

See also at().

using namespace Qt::Literals::StringLiterals;

auto str = "hello"_L1;