Struct qt_widgets::QPairOfDoubleDouble

#[repr(C)]pub struct QPairOfDoubleDouble { /* fields omitted */ }

The QPair class is a template class that stores a pair of items.

C++ class: QPair<double, double>.

C++ documentation:

The QPair class is a template class that stores a pair of items.

QPair<T1, T2> can be used in your application if the STL pair type is not available. It stores one value of type T1 and one value of type T2. It can be used as a return value for a function that needs to return two values, or as the value type of a generic container.

Here's an example of a QPair that stores one QString and one double value:

QPair<QString, double> pair;

The components are accessible as public data members called first and second. For example:

pair.first = "pi";
pair.second = 3.14159265358979323846;

Note, however, that it is almost always preferable to define a small struct to hold the result of a function with multiple return values. A struct trivially generalizes to more than two values, and allows more descriptive member names than first and second:

struct Variable {
      QString name;
      double value;
};
Variable v;
v.name = "pi";
v.value = 3.14159265358979323846;

The advent of C++11 automatic variable type deduction (auto) shifts the emphasis from the type name to the name of functions and members. Thus, QPair, like std::pair and std::tuple, is mostly useful in generic (template) code, where defining a dedicated type is not possible.

QPair's template data types (T1 and T2) must be assignable data types. You cannot, for example, store a QWidget as a value; instead, store a QWidget *. A few functions have additional requirements; these requirements are documented on a per-function basis.

Methods

impl QPairOfDoubleDouble

pub unsafe fn copy_from(
    &self,
    other: impl CastInto<Ref<QPairOfDoubleDouble>>
) -> Ref<QPairOfDoubleDouble>

The QPair class is a template class that stores a pair of items.

Calls C++ function: QPair<double, double>& QPair<double, double>::operator=(const QPair<double, double>& other).

C++ documentation:

The QPair class is a template class that stores a pair of items.

QPair<T1, T2> can be used in your application if the STL pair type is not available. It stores one value of type T1 and one value of type T2. It can be used as a return value for a function that needs to return two values, or as the value type of a generic container.

Here's an example of a QPair that stores one QString and one double value:

QPair<QString, double> pair;

The components are accessible as public data members called first and second. For example:

pair.first = "pi";
pair.second = 3.14159265358979323846;

Note, however, that it is almost always preferable to define a small struct to hold the result of a function with multiple return values. A struct trivially generalizes to more than two values, and allows more descriptive member names than first and second:

struct Variable {
      QString name;
      double value;
};
Variable v;
v.name = "pi";
v.value = 3.14159265358979323846;

The advent of C++11 automatic variable type deduction (auto) shifts the emphasis from the type name to the name of functions and members. Thus, QPair, like std::pair and std::tuple, is mostly useful in generic (template) code, where defining a dedicated type is not possible.

QPair's template data types (T1 and T2) must be assignable data types. You cannot, for example, store a QWidget as a value; instead, store a QWidget *. A few functions have additional requirements; these requirements are documented on a per-function basis.

pub unsafe fn new_0a() -> CppBox<QPairOfDoubleDouble>

Constructs an empty pair. The first and second elements are initialized with default-constructed values.

Calls C++ function: [constructor] void QPair<double, double>::QPair().

C++ documentation:

Constructs an empty pair. The first and second elements are initialized with default-constructed values.

pub unsafe fn new_2a(
    t1: *const c_double,
    t2: *const c_double
) -> CppBox<QPairOfDoubleDouble>

Constructs a pair and initializes the first element with value1 and the second element with value2.

Calls C++ function: [constructor] void QPair<double, double>::QPair(const double& t1, const double& t2).

C++ documentation:

Constructs a pair and initializes the first element with value1 and the second element with value2.

See also qMakePair().

pub unsafe fn new_copy(
    other: impl CastInto<Ref<QPairOfDoubleDouble>>
) -> CppBox<QPairOfDoubleDouble>

The QPair class is a template class that stores a pair of items.

Calls C++ function: [constructor] void QPair<double, double>::QPair(const QPair<double, double>& other).

C++ documentation:

The QPair class is a template class that stores a pair of items.

QPair<T1, T2> can be used in your application if the STL pair type is not available. It stores one value of type T1 and one value of type T2. It can be used as a return value for a function that needs to return two values, or as the value type of a generic container.

Here's an example of a QPair that stores one QString and one double value:

QPair<QString, double> pair;

The components are accessible as public data members called first and second. For example:

pair.first = "pi";
pair.second = 3.14159265358979323846;

Note, however, that it is almost always preferable to define a small struct to hold the result of a function with multiple return values. A struct trivially generalizes to more than two values, and allows more descriptive member names than first and second:

struct Variable {
      QString name;
      double value;
};
Variable v;
v.name = "pi";
v.value = 3.14159265358979323846;

The advent of C++11 automatic variable type deduction (auto) shifts the emphasis from the type name to the name of functions and members. Thus, QPair, like std::pair and std::tuple, is mostly useful in generic (template) code, where defining a dedicated type is not possible.

QPair's template data types (T1 and T2) must be assignable data types. You cannot, for example, store a QWidget as a value; instead, store a QWidget *. A few functions have additional requirements; these requirements are documented on a per-function basis.

pub unsafe fn swap(&self, other: impl CastInto<Ref<QPairOfDoubleDouble>>)

Swaps this pair with other.

Calls C++ function: void QPair<double, double>::swap(QPair<double, double>& other).

C++ documentation:

Swaps this pair with other.

Equivalent to

qSwap(this->first, other.first);
qSwap(this->second, other.second);

Swap overloads are found in namespace std as well as via argument-dependent lookup (ADL) in the namespace of T .

This function was introduced in Qt 5.5.

Trait Implementations

impl CppDeletable for QPairOfDoubleDouble

unsafe fn delete(&self)

The QPair class is a template class that stores a pair of items.

Calls C++ function: [destructor] void QPair<double, double>::~QPair().

C++ documentation:

The QPair class is a template class that stores a pair of items.

QPair<T1, T2> can be used in your application if the STL pair type is not available. It stores one value of type T1 and one value of type T2. It can be used as a return value for a function that needs to return two values, or as the value type of a generic container.

Here's an example of a QPair that stores one QString and one double value:

QPair<QString, double> pair;

The components are accessible as public data members called first and second. For example:

pair.first = "pi";
pair.second = 3.14159265358979323846;

Note, however, that it is almost always preferable to define a small struct to hold the result of a function with multiple return values. A struct trivially generalizes to more than two values, and allows more descriptive member names than first and second:

struct Variable {
      QString name;
      double value;
};
Variable v;
v.name = "pi";
v.value = 3.14159265358979323846;

The advent of C++11 automatic variable type deduction (auto) shifts the emphasis from the type name to the name of functions and members. Thus, QPair, like std::pair and std::tuple, is mostly useful in generic (template) code, where defining a dedicated type is not possible.

QPair's template data types (T1 and T2) must be assignable data types. You cannot, for example, store a QWidget as a value; instead, store a QWidget *. A few functions have additional requirements; these requirements are documented on a per-function basis.

impl Ge<Ref<QPairOfDoubleDouble>> for QPairOfDoubleDouble

unsafe fn ge(&self, p2: &Ref<QPairOfDoubleDouble>) -> bool

Returns true if the numeric Unicode value of c1 is greater than or equal to that of c2; otherwise returns false.

Calls C++ function: bool operator>=(const QPair<double, double>& p1, const QPair<double, double>& p2).

Warning: no exact match found in C++ documentation. Below is the C++ documentation for bool operator>=(QChar c1, QChar c2):

Returns true if the numeric Unicode value of c1 is greater than or equal to that of c2; otherwise returns false.

impl Gt<Ref<QPairOfDoubleDouble>> for QPairOfDoubleDouble

unsafe fn gt(&self, p2: &Ref<QPairOfDoubleDouble>) -> bool

Calls C++ function: bool operator>(const QPair<double, double>& p1, const QPair<double, double>& p2).

impl Le<Ref<QPairOfDoubleDouble>> for QPairOfDoubleDouble

unsafe fn le(&self, p2: &Ref<QPairOfDoubleDouble>) -> bool

Returns true if the numeric Unicode value of c1 is less than or equal to that of c2; otherwise returns false.

Calls C++ function: bool operator<=(const QPair<double, double>& p1, const QPair<double, double>& p2).

Warning: no exact match found in C++ documentation. Below is the C++ documentation for bool operator<=(QChar c1, QChar c2):

Returns true if the numeric Unicode value of c1 is less than or equal to that of c2; otherwise returns false.

impl Lt<Ref<QPairOfDoubleDouble>> for QPairOfDoubleDouble

unsafe fn lt(&self, p2: &Ref<QPairOfDoubleDouble>) -> bool

Calls C++ function: bool operator<(const QPair<double, double>& p1, const QPair<double, double>& p2).

impl PartialEq<Ref<QPairOfDoubleDouble>> for QPairOfDoubleDouble

fn eq(&self, p2: &Ref<QPairOfDoubleDouble>) -> bool

Returns true if c1 and c2 are the same Unicode character; otherwise returns false.

Calls C++ function: bool operator==(const QPair<double, double>& p1, const QPair<double, double>& p2).

Warning: no exact match found in C++ documentation. Below is the C++ documentation for bool operator==(QChar c1, QChar c2):

Returns true if c1 and c2 are the same Unicode character; otherwise returns false.

#[must_use]fn ne(&self, other: &Rhs) -> bool

This method tests for !=.