StringLiterals Namespace

Qt::Literals::StringLiterals

The StringLiterals namespace declares string literal operators for Qt types. 更多...

头：	#include <QStringLiterals>
CMake:	find_package(Qt6 REQUIRED COMPONENTS Core) target_link_libraries(mytarget PRIVATE Qt6::Core)
qmake:	QT += core

函数

QLatin1Char	operator""_L1 (char ch )
QLatin1StringView	operator""_L1 (const char * str , size_t size )
QByteArray	operator""_ba (const char * str , size_t size )
QString	operator""_s (const char16_t * str , size_t size )

详细描述

The inline Qt::Literals::StringLiterals namespace declares string literal operators for Qt types. Because both Literals and StringLiterals namespaces are declared as inline, the symbols from this namespace can be accessed by adding one of the following to your code:

// Makes visible only the literal operators declared in StringLiterals
using namespace Qt::Literals::StringLiterals;
// Makes visible literal operators declared in all inline namespaces
// inside Literals
using namespace Qt::Literals;
// Makes visible all symbols (including all literal operators) declared
// in the Qt namespace
using namespace Qt;
					

函数文档编制

[constexpr, since 6.4] QLatin1Char operator""_L1 ( char ch )

文字运算符创建的 QLatin1Char out of ch .

以下代码创建 QLatin1Char :

using namespace Qt::Literals::StringLiterals;
auto ch = 'a'_L1;
					

该函数在 Qt 6.4 引入。

另请参阅 Qt::Literals::StringLiterals .

[constexpr, since 6.4] QLatin1StringView operator""_L1 (const char * str , size_t size )

文字运算符创建的 QLatin1StringView out of the first size characters in the char string literal str .

以下代码创建 QLatin1StringView :

using namespace Qt::Literals::StringLiterals;
auto str = "hello"_L1;
					

该函数在 Qt 6.4 引入。

另请参阅 Qt::Literals::StringLiterals .

[since 6.4] QByteArray operator""_ba (const char * str , size_t size )

文字运算符创建的 QByteArray out of the first size characters in the char string literal str .

The QByteArray is created at compile time, and the generated string data is stored in the read-only segment of the compiled object file. Duplicate literals may share the same read-only memory. This functionality is interchangeable with QByteArrayLiteral , but saves typing when many string literals are present in the code.

以下代码创建 QByteArray :

using namespace Qt::Literals::StringLiterals;
auto str = "hello"_ba;
					

该函数在 Qt 6.4 引入。

另请参阅 Qt::Literals::StringLiterals .

[since 6.4] QString operator""_s (const char16_t * str , size_t size )

文字运算符创建的 QString out of the first size characters in the char16_t string literal str .

The QString is created at compile time, and the generated string data is stored in the read-only segment of the compiled object file. Duplicate literals may share the same read-only memory. This functionality is interchangeable with QStringLiteral , but saves typing when many string literals are present in the code.

以下代码创建 QString :

using namespace Qt::Literals::StringLiterals;
auto str = u"hello"_s;
					

该函数在 Qt 6.4 引入。

另请参阅 Qt::Literals::StringLiterals .

内容

• 函数

• 详细描述