Object 接球手和接球手
我刚开始在Ada上编程,我想知道如何编写getter和setter来处理类属性 事实上,我对获取以下包的截止日期、周期和计算时间的属性获取者和设置者感兴趣:Object 接球手和接球手,object,get,set,ada,Object,Get,Set,Ada,我刚开始在Ada上编程,我想知道如何编写getter和setter来处理类属性 事实上,我对获取以下包的截止日期、周期和计算时间的属性获取者和设置者感兴趣: with Ada.Text_IO; use Ada.Text_IO; with Ada.Real_Time; use Ada.Real_Time; package body pkg_tasks is task body task_a is deadline : Time_Span := To_Time_Span(2
with Ada.Text_IO; use Ada.Text_IO;
with Ada.Real_Time; use Ada.Real_Time;
package body pkg_tasks is
task body task_a is
deadline : Time_Span := To_Time_Span(25.0);
period : Time_Span := To_Time_Span(25.0);
computingTime : Time_Span := To_Time_Span(10.0);
startingTime : Time;
begin
entry start do
startingTime := Clock;
while (Clock - startingTime) < computingTime loop
end loop;
New_line;
Put_Line("End of task A");
end start;
end task_a;
end pkg_tasks;
在任务的情况下,这很容易。。。由于与我们在中的回答相同的原因,您不能这样做,任务只能有作为同步任务读取和以下内容的方式的条目 但事实上,您可以执行一种getter作为条目,并根据您想要查询属性的时间使用选择性等待 现在,关于在任务中设置属性,在开始条目中使用参数在我看来是最好的方法
请注意,您正在编写关于类属性的内容,但目前根本没有使用任何类。任务是Ada中的第一个公民类型,不像Java中那样通过类类型实现。在这里,使用面向对象编程是另一回事。对于任务来说,很容易。。。由于与我们在中的回答相同的原因,您不能这样做,任务只能有作为同步任务读取和以下内容的方式的条目 但事实上,您可以执行一种getter作为条目,并根据您想要查询属性的时间使用选择性等待 现在,关于在任务中设置属性,在开始条目中使用参数在我看来是最好的方法
请注意,您正在编写关于类属性的内容,但目前根本没有使用任何类。任务是Ada中的第一个公民类型,不像Java中那样通过类类型实现。在这里,使用面向对象编程是另一回事。如上所述,一般来说,任务不是正常的方式。在Ada83中,没有受保护的类型,所以如果您需要类似的类型,那么您可以通过一个任务来模拟它。除此之外,以下是一些使用任务、受保护类型和类或Ada称之为标记类型的示例:
with Ada.Text_IO; use Ada.Text_IO;
with Ada.Real_Time; use Ada.Real_Time;
procedure jdoodle is
------------------------------------------------------
-- Task Example
------------------------------------------------------
task Task_Example is
entry Get(Time : out Time_Span);
entry Set(Time : in Time_Span);
end Task_Example;
task body Task_Example is
Value : Time_Span := To_Time_Span(0.0);
begin
loop
select
accept Get(Time : out Time_Span) do
Time := Value;
end Get;
or
accept Set(Time : in Time_Span) do
Value := Time;
end Set;
or
terminate;
end select;
end loop;
end Task_Example;
------------------------------------------------------
-- Protected type example
------------------------------------------------------
protected type Protected_Example is
procedure Put(Time : Time_Span); -- or use entry
function Get return Time_Span; -- or use procedure or entry
private
Value : Time_Span := To_Time_Span(0.0);
end Protected_Example;
protected body Protected_Example is
procedure Put(Time : Time_Span) is
begin
Value := Time;
end Put;
function Get return Time_Span is
begin
return Value;
end Get;
end Protected_Example;
------------------------------------------------------
-- Class Example
------------------------------------------------------
package Classes is
type Class_Example is tagged limited private;
procedure Put(Self : in out Class_Example; Time : Time_Span);
function Get(Self : in Class_Example) return Time_Span; -- or use procedure
private
type Class_Example is tagged limited record
Value : Time_Span := To_Time_Span(0.0);
end record;
end Classes;
package body Classes is
procedure Put(Self : in out Class_Example; Time : Time_Span) is
begin
Self.Value := Time;
end Put;
function Get(Self : in Class_Example) return Time_Span is
begin
return Self.Value;
end Get;
end Classes;
begin
Put_Line("Starting");
end jdoodle;
请记住,标记类型示例也适用于常规记录和其他私有类型。如上所述,通常情况下,任务不是执行此操作的正常方式。在Ada83中,没有受保护的类型,所以如果您需要类似的类型,那么您可以通过一个任务来模拟它。除此之外,以下是一些使用任务、受保护类型和类或Ada称之为标记类型的示例:
with Ada.Text_IO; use Ada.Text_IO;
with Ada.Real_Time; use Ada.Real_Time;
procedure jdoodle is
------------------------------------------------------
-- Task Example
------------------------------------------------------
task Task_Example is
entry Get(Time : out Time_Span);
entry Set(Time : in Time_Span);
end Task_Example;
task body Task_Example is
Value : Time_Span := To_Time_Span(0.0);
begin
loop
select
accept Get(Time : out Time_Span) do
Time := Value;
end Get;
or
accept Set(Time : in Time_Span) do
Value := Time;
end Set;
or
terminate;
end select;
end loop;
end Task_Example;
------------------------------------------------------
-- Protected type example
------------------------------------------------------
protected type Protected_Example is
procedure Put(Time : Time_Span); -- or use entry
function Get return Time_Span; -- or use procedure or entry
private
Value : Time_Span := To_Time_Span(0.0);
end Protected_Example;
protected body Protected_Example is
procedure Put(Time : Time_Span) is
begin
Value := Time;
end Put;
function Get return Time_Span is
begin
return Value;
end Get;
end Protected_Example;
------------------------------------------------------
-- Class Example
------------------------------------------------------
package Classes is
type Class_Example is tagged limited private;
procedure Put(Self : in out Class_Example; Time : Time_Span);
function Get(Self : in Class_Example) return Time_Span; -- or use procedure
private
type Class_Example is tagged limited record
Value : Time_Span := To_Time_Span(0.0);
end record;
end Classes;
package body Classes is
procedure Put(Self : in out Class_Example; Time : Time_Span) is
begin
Self.Value := Time;
end Put;
function Get(Self : in Class_Example) return Time_Span is
begin
return Self.Value;
end Get;
end Classes;
begin
Put_Line("Starting");
end jdoodle;
请记住,标记类型示例也适用于常规记录和其他私有类型。好的,谢谢您的时间。正如你所看到的,我在这里很忙,哈哈,谢谢你的时间。正如你所看到的,我在这里很无聊哈哈