属性 (编程) - 维基百科,自由的百科全书
属性(Property),在一些面向对象编程语言中,是类的特殊成员,功能上居于字段(或数据成员)与方法之间。可读可写属性的语法类似于字段,但属性的读写操作通常被编译为getter与setter方法调用。属性使用类似于字段的读写语法,比普通的方法调用的语法形式更易于读写操作;但属性读写编译为内部的方法调用,则可以支持数据确认、主动修改或实现只读字段等功能。
语言支持
[编辑]支持属性的编程语言有:ActionScript 3、C#、D、Delphi/Free Pascal、eC、F#、Kotlin、JavaScript、Objective-C 2.0、Python、Scala、Swift、Lua、Visual Basic。
一些面向对象语言,如Java与C++,不支持属性,而要求编程者写一对accessor与mutator方法。 C++可以通过运算符重载来模拟属性。
不同的语法
[编辑]一些语言用点表示,另一些语言用方括号表示,来访问属性。
点表示法
[编辑]如JavaScript:
document.createElement('pre');
方括号表示法
[编辑]JavaScript也可以用方括号来访问属性:
document['createElement']('pre');
具体语言实现舉例
[编辑]C#
[编辑]class Pen { private int color; // private field // public property public int Color { get { return this.color; } set { if (value > 0) { this.color = value; } } } }
// accessing: Pen pen = new Pen(); int color_tmp = 0; // ... pen.Color = 17; color_tmp = pen.Color; // ... pen.Color = ~pen.Color; // bitwise complement ... // another silly example: pen.Color += 1; // a lot clearer than "pen.set_Color(pen.get_Color() + 1)"!
高版本的C#支持编译器自动实现属性。
class Shape { public Int32 Height { get; set; } public Int32 Width { get; private set; } }
C++
[编辑]C++有多种方法模拟属性实现。
#include <iostream> template <typename T> class property { T value; public: T & operator = (const T &i) { return value = i; } // This template class member function template serves the purpose to make // typing more strict. Assignment to this is only possible with exact identical types. // The reason why it will cause an error is temporary variable created while implicit type conversion in reference initialization. template <typename T2> T2 & operator = (const T2 &i) { T2 &guard = value; throw guard; // Never reached. } // Implicit conversion back to T. operator T const & () const { return value; } }; struct Foo { // Properties using unnamed classes. class { int value; public: int & operator = (const int &i) { return value = i; } operator int () const { return value; } } alpha; class { float value; public: float & operator = (const float &f) { return value = f; } operator float () const { return value; } } bravo; }; struct Bar { // Using the property<>-template. property <bool> alpha; property <unsigned int> bravo; }; int main () { Foo foo; foo.alpha = 5; foo.bravo = 5.132f; Bar bar; bar.alpha = true; bar.bravo = true; // This line will yield a compile time error // due to the guard template member function. ::std::cout << foo.alpha << ", " << foo.bravo << ", " << bar.alpha << ", " << bar.bravo << ::std::endl; return 0; }
C++, Microsoft & C++Builder的方言语法
[编辑]例子来自MSDN documentation page (页面存档备份,存于互联网档案馆):
// declspec_property.cpp struct S { int i; void putprop(int j) { i = j; } int getprop() { return i; } __declspec(property(get = getprop, put = putprop)) int the_prop; }; int main() { S s; s.the_prop = 5; return s.the_prop; }
JavaScript
[编辑]function Pen() { this._color = 0; } // Add the property to the Pen type itself, can also // be set on the instance individually Object.defineProperties(Pen.prototype, { color: { get: function () { return this._color; }, set: function (value) { this._color = value; } } });
var pen = new Pen(); pen.color = ~pen.color; // bitwise complement pen.color += 1; // Add one
Python
[编辑]Python 2.2开始的new-style classes (即派生自object
的类)支持属性。见the relevant section of the tutorial Unifying types and classes in Python 2.2 (页面存档备份,存于互联网档案馆)。Python 2.6支持了定义属性的装饰器语法。
class Pen: def __init__(self) -> None: self._color = 0 # "private" variable @property def color(self): return self._color @color.setter def color(self, color): self._color = color
pen = Pen() # Accessing: pen.color = ~pen.color # Bitwise complement ...