内容

• 公共函数
• 静态公共成员
• 相关非成员
• 详细描述

QVersionNumber 类

QVersionNumber class contains a version number with an arbitrary number of segments. 更多...

头：	#include <QVersionNumber>
qmake:	QT += core
Since:	Qt 5.6

• 所有成员列表，包括继承成员

公共函数

	QVersionNumber ()
	QVersionNumber (const QVector<int> & seg )
	QVersionNumber (QVector<int> && seg )
	QVersionNumber (std::initializer_list<int> args )
	QVersionNumber (int maj )
	QVersionNumber (int maj , int min )
	QVersionNumber (int maj , int min , int mic )
bool	isNormalized () const
bool	isNull () const
bool	isPrefixOf (const QVersionNumber & other ) const
int	majorVersion () const
int	microVersion () const
int	minorVersion () const
QVersionNumber	normalized () const
int	segmentAt (int index ) const
int	segmentCount () const
QVector<int>	segments () const
QString	toString () const

静态公共成员

QVersionNumber	commonPrefix (const QVersionNumber & v1 , const QVersionNumber & v2 )
int	compare (const QVersionNumber & v1 , const QVersionNumber & v2 )
QVersionNumber	fromString (const QString & string , int * suffixIndex = Q_NULLPTR)

相关非成员

bool	operator!= (const QVersionNumber & lhs , const QVersionNumber & rhs )
bool	operator< (const QVersionNumber & lhs , const QVersionNumber & rhs )
QDataStream &	operator<< (QDataStream & out , const QVersionNumber & version )
bool	operator<= (const QVersionNumber & lhs , const QVersionNumber & rhs )
bool	operator== (const QVersionNumber & lhs , const QVersionNumber & rhs )
bool	operator> (const QVersionNumber & lhs , const QVersionNumber & rhs )
bool	operator>= (const QVersionNumber & lhs , const QVersionNumber & rhs )
QDataStream &	operator>> (QDataStream & in , QVersionNumber & version )

详细描述

QVersionNumber class contains a version number with an arbitrary number of segments.

QVersionNumber version(1, 2, 3);  // 1.2.3
					

成员函数文档编制

QVersionNumber:: QVersionNumber ()

Produces a null version.

另请参阅 isNull ().

QVersionNumber:: QVersionNumber (const QVector < int > & seg )

Constructs a version number from the list of numbers contained in seg .

QVersionNumber:: QVersionNumber ( QVector < int > && seg )

Move-constructs a version number from the list of numbers contained in seg .

This constructor is only enabled if the compiler supports C++11 move semantics.

QVersionNumber:: QVersionNumber ( std::initializer_list < int > args )

Construct a version number from the std::initializer_list specified by args .

This constructor is only enabled if the compiler supports C++11 initializer lists.

QVersionNumber:: QVersionNumber ( int maj )

构造 QVersionNumber consisting of just the major version number maj .

QVersionNumber:: QVersionNumber ( int maj , int min )

构造 QVersionNumber consisting of the major and minor version numbers maj and min ，分别。

QVersionNumber:: QVersionNumber ( int maj , int min , int mic )

构造 QVersionNumber consisting of the major, minor, and micro version numbers maj , min and mic ，分别。

[static] QVersionNumber QVersionNumber:: commonPrefix (const QVersionNumber & v1 , const QVersionNumber & v2 )

QVersionNumber QVersionNumber::commonPrefix(const QVersionNumber &v1, const QVersionNumber &v2)

Returns a version number that is a parent version of both v1 and v2 .

另请参阅 isPrefixOf ().

[static] int QVersionNumber:: compare (const QVersionNumber & v1 , const QVersionNumber & v2 )

比较 v1 with v2 and returns an integer less than, equal to, or greater than zero, depending on whether v1 is less than, equal to, or greater than v2 ，分别。

Comparisons are performed by comparing the segments of v1 and v2 starting at index 0 and working towards the end of the longer list.

QVersionNumber v1(1, 2);
QVersionNumber v2(1, 2, 0);
int compare = QVersionNumber::compare(v1, v2); // compare == -1
					

[static] QVersionNumber QVersionNumber:: fromString (const QString & string , int * suffixIndex = Q_NULLPTR)

构造 QVersionNumber from a specially formatted string of non-negative decimal numbers delimited by a period ( . ).

Once the numerical segments have been parsed, the remainder of the string is considered to be the suffix string. The start index of that string will be stored in suffixIndex if it is not null.

QString string("5.4.0-alpha");
int suffixIndex;
QVersionNumber version = QVersionNumber::fromString(string, &suffixIndex);
// version is 5.4.0
// suffixIndex is 5
					

另请参阅 isNull ().

bool QVersionNumber:: isNormalized () const

返回 true if the version number does not contain any trailing zeros, otherwise returns false .

另请参阅 normalized ().

bool QVersionNumber:: isNull () const

返回 true if there are zero numerical segments, otherwise returns false .

另请参阅 segments ().

bool QVersionNumber:: isPrefixOf (const QVersionNumber & other ) const

返回 true if the current version number is contained in the other version number, otherwise returns false .

QVersionNumber v1(5, 3);
QVersionNumber v2(5, 3, 1);
bool value = v1.isPrefixOf(v2); // true
					

另请参阅 commonPrefix ().

int QVersionNumber:: majorVersion () const

Returns the major version number, that is, the first segment. This function is equivalent to segmentAt (0). If this QVersionNumber object is null, this function returns 0.

另请参阅 isNull () 和 segmentAt ().

int QVersionNumber:: microVersion () const

Returns the micro version number, that is, the third segment. This function is equivalent to segmentAt (2). If this QVersionNumber object does not contain a micro number, this function returns 0.

另请参阅 isNull () 和 segmentAt ().

int QVersionNumber:: minorVersion () const

Returns the minor version number, that is, the second segment. This function is equivalent to segmentAt (1). If this QVersionNumber object does not contain a minor number, this function returns 0.

另请参阅 isNull () 和 segmentAt ().

QVersionNumber QVersionNumber:: normalized () const

Returns an equivalent version number but with all trailing zeros removed.

To check if two numbers are equivalent, use normalized() on both version numbers before performing the compare.

QVersionNumber v1(5, 4);
QVersionNumber v2(5, 4, 0);
bool equivalent = v1.normalized() == v2.normalized();
bool equal = v1 == v2;
// equivalent is true
// equal is false
					

int QVersionNumber:: segmentAt ( int index ) const

Returns the segement value at index . If the index does not exist, returns 0.

另请参阅 segments () 和 segmentCount ().

int QVersionNumber:: segmentCount () const

Returns the number of integers stored in segments ().

另请参阅 segments ().

QVector < int > QVersionNumber:: segments () const

Returns all of the numerical segments.

另请参阅 majorVersion (), minorVersion ()，和 microVersion ().

QString QVersionNumber:: toString () const

Returns a string with all of the segments delimited by a period ( . ).

另请参阅 majorVersion (), minorVersion (), microVersion ()，和 segments ().

相关非成员

bool operator!= (const QVersionNumber & lhs , const QVersionNumber & rhs )

返回 true if lhs 不等于 rhs ；否则返回 false .

另请参阅 QVersionNumber::compare ().

bool operator< (const QVersionNumber & lhs , const QVersionNumber & rhs )

返回 true if lhs is less than rhs ；否则返回 false .

另请参阅 QVersionNumber::compare ().

QDataStream & operator<< ( QDataStream & out , const QVersionNumber & version )

Writes the version number version 到流 out .

Note that this has nothing to do with QDataStream::version ().

bool operator<= (const QVersionNumber & lhs , const QVersionNumber & rhs )

返回 true if lhs 小于等于 rhs ；否则返回 false .

另请参阅 QVersionNumber::compare ().

bool operator== (const QVersionNumber & lhs , const QVersionNumber & rhs )

返回 true if lhs 等于 rhs ；否则返回 false .

另请参阅 QVersionNumber::compare ().

bool operator> (const QVersionNumber & lhs , const QVersionNumber & rhs )

返回 true if lhs 大于 rhs ；否则返回 false .

另请参阅 QVersionNumber::compare ().

bool operator>= (const QVersionNumber & lhs , const QVersionNumber & rhs )

返回 true if lhs is greater than or equal to rhs ；否则返回 false .

另请参阅 QVersionNumber::compare ().

QDataStream & operator>> ( QDataStream & in , QVersionNumber & version )

Reads a version number from stream in and stores it in version .

Note that this has nothing to do with QDataStream::version ().