问题描述
我正在尝试创建一个系统，其中有一个类（“Delegator”）可以自动将“任务”委托给“组件”，并且组件应该将任务委托给它的方法之一（“处理程序”） .委托人持有字符串（组件名称）到组件指针的映射，组件持有字符串（处理程序名称）到处理程序的映射。任务包含它们应该被委派给的组件的名称、应该被调用的组件处理程序的名称以及应该被操作的数据。任务作为 unique_ptrs 传递。我也想拥有它，以便将来可以根据需要添加组件。我几乎让它工作了，但我被一个我似乎无法解决的错误挂了。以下是相关代码（抱歉代码转储）：
委托人：
class Delegator{
public:
Delegator() {}
void registerComponent(Component &component) {
std::cout << "Registering component " << component.getName() << " with the Delegator" << endl;
componentMap[component.getName()] = &component;
}
void delegate(unique_ptr<Task> task) {
std::cout << "Delegating command " << (*task).getCommand() << " to " << (*task).getLocalComp() << endl;
(*componentMap[(*task).getLocalComp()]).executeTask(move(task));
}
private:
map<string,Component*> componentMap;
};
组件：
#include "Task.h"
using namespace std;
class Component {
public:
// Constructor
Component(string name): name(name) {}
// Types
typedef boost::function<void (unique_ptr<Task>)> task_handler;
typedef map<string,task_handler> task_map;
// Methods
void registerHandler(string name,task_handler h){
std::cout << "Registering handler " << name << " with component " << this->getName() << endl;
cmds[name] = h;
}
void executeTask(unique_ptr<Task> task){
std::cout << "Component " << this->getName() << " executing task " << (*task).getCommand() << endl;
try{
task_handler handler = cmds[(*task).getCommand()];
handler(move(task));
} catch (std::exception& e) {
std::cerr << "Tried calling unregistered or nonexistent task handler: " << e.what() << std::endl;
}
}
string getName() {return name;}
private:
string name;
task_map cmds;
};
一个示例组件：
#include "Component.h"
class Adder: public Component {
public:
Adder(): Component("Adder"){
cout << "Initializing Adder Component" << endl;
registerHandler("add1",boost::lambda::bind(&Adder::add1,this,boost::lambda::_1));
// ^^^^^^^^^^^^^^^ error
cout << "Adder Component finished initializing" << endl;
}
void add1(unique_ptr<Task> task) {
(*task).setData((*task).getData() + 1);
}
};
主要：
#include "include/Delegator.h"
#include "include/Adder.h"
#include "include/Subtracter.h"
#include "include/Task.h"
#include "include/Cmds.h"
int main() {
// Initialize Tasks
unique_ptr<Task> task = make_unique<Task>("add1","Adder","",1);
// Initialize Delegator
Delegator d;
// Initialize Components
Adder adder = Adder();
// Register Components
d.registerComponent(adder);
cout << endl << "Registration Complete\n" << endl;
// Do stuff
(*task).printStatus();
d.delegate(move(task));
(*task).printStatus();
}
在 Adder 类中没有 registerHandler() 行的情况下，代码编译得很好。添加该行后，我收到以下错误：
[build] In file included from /usr/local/include/boost/lambda/core.hpp:50,[build] from /usr/local/include/boost/lambda/bind.hpp:15,[build] from .../auto_delegate_demo/include/Component.h:6,[build] from .../auto_delegate_demo/include/Delegator.h:3,[build] from .../auto_delegate_demo/main.cpp:2:
[build] /usr/local/include/boost/lambda/detail/function_adaptors.hpp: In instantiation of ‘static Result boost::lambda::function_adaptor<Result (Object::*)(Arg1)>::apply(Result (Object::*)(Arg1),Object*,A1&) [with RET = void; A1 = const std::unique_ptr<Task>; Object = Adder; Arg1 = std::unique_ptr<Task>; Result = void]’:
[build] /usr/local/include/boost/lambda/detail/actions.hpp:96:26: required from ‘static RET boost::lambda::function_action<3,T>::apply(A1&,A2&,A3&) [with RET = void; A1 = void (Adder::* const)(std::unique_ptr<Task>); A2 = Adder* const; A3 = const std::unique_ptr<Task>; T = boost::lambda::detail::unspecified]’
[build] /usr/local/include/boost/lambda/detail/lambda_functor_base.hpp:437:34: required from ‘RET boost::lambda::lambda_functor_base<boost::lambda::action<3,Act>,Args>::call(A&,B&,C&,Env&) const [with RET = void; A = const std::unique_ptr<Task>; B = const boost::tuples::null_type; C = const boost::tuples::null_type; Env = const boost::tuples::null_type; Act = boost::lambda::function_action<3>; Args = boost::tuples::tuple<void (Adder::* const)(std::unique_ptr<Task>),Adder* const,const boost::lambda::lambda_functor<boost::lambda::placeholder<1> >,boost::tuples::null_type,boost::tuples::null_type>]’
[build] /usr/local/include/boost/lambda/detail/lambda_functors.hpp:203:6: required from ‘typename boost::lambda::lambda_functor<Base>::inherited::sig<boost::tuples::tuple<const A&,boost::tuples::null_type> >::type boost::lambda::lambda_functor<Base>::operator()(const A&) const [with A = std::unique_ptr<Task>; T = boost::lambda::lambda_functor_base<boost::lambda::action<3,boost::lambda::function_action<3> >,boost::tuples::tuple<void (Adder::* const)(std::unique_ptr<Task>),boost::tuples::null_type> >; typename boost::lambda::lambda_functor<Base>::inherited::sig<boost::tuples::tuple<const A&,boost::tuples::null_type> >::type = void]’
[build] /usr/local/include/boost/function/function_template.hpp:158:11: required from ‘static void boost::detail::function::void_function_obj_invoker1<FunctionObj,R,T0>::invoke(boost::detail::function::function_buffer&,T0) [with FunctionObj = boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<3,boost::tuples::null_type> > >; R = void; T0 = std::unique_ptr<Task>]’
[build] /usr/local/include/boost/function/function_template.hpp:940:38: required from ‘void boost::function1<R,T1>::assign_to(Functor) [with Functor = boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<3,boost::tuples::null_type> > >; R = void; T0 = std::unique_ptr<Task>]’
[build] /usr/local/include/boost/function/function_template.hpp:720:7: required from ‘boost::function1<R,T1>::function1(Functor,typename boost::enable_if_<(! boost::is_integral<Functor>::value),int>::type) [with Functor = boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::action<3,boost::tuples::null_type> > >; R = void; T0 = std::unique_ptr<Task>; typename boost::enable_if_<(! boost::is_integral<Functor>::value),int>::type = int]’
[build] /usr/local/include/boost/function/function_template.hpp:1086:16: required from ‘boost::function<R(T0)>::function(Functor,int>::type = int]’
[build] .../auto_delegate_demo/include/Adder.h:10:91: required from here
[build] /usr/local/include/boost/lambda/detail/function_adaptors.hpp:395:22: error: use of deleted function ‘std::unique_ptr<_Tp,_Dp>::unique_ptr(const std::unique_ptr<_Tp,_Dp>&) [with _Tp = Task; _Dp = std::default_delete<Task>]’
[build] 395 | return (o->*func)(a1);
[build] | ~~~~~~~~~~^~~~
[build] In file included from /opt/rh/devtoolset-9/root/usr/include/c++/9/memory:80,[build] from /usr/local/include/boost/function/function_base.hpp:16,[build] from /usr/local/include/boost/function/detail/prologue.hpp:17,[build] from /usr/local/include/boost/function.hpp:30,[build] from .../auto_delegate_demo/include/Component.h:5,[build] from .../auto_delegate_demo/main.cpp:2:
[build] /opt/rh/devtoolset-9/root/usr/include/c++/9/bits/unique_ptr.h:414:7: note: declared here
[build] 414 | unique_ptr(const unique_ptr&) = delete;
[build] | ^~~~~~~~~~
[build] In file included from /usr/local/include/boost/lambda/core.hpp:50,[build] from .../auto_delegate_demo/main.cpp:2:
[build] /usr/local/include/boost/lambda/detail/function_adaptors.hpp:395:25: error: return-statement with a value,in function returning ‘void’ [-fpermissive]
[build] 395 | return (o->*func)(a1);
[build] | ^
提前致谢
解决方法
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