scope

问题 Is the destruction of automatic objects (objects created on the stack) guaranteed to be executed not before they go out of scope? To clarify: #include <iostream> class A { public: A() { std::cout << "1"; } ~A() { std::cout << "3"; } }; void test123() { A a; std::cout << "2"; } To print "2" , a is not required any more, so theoretically the compiler could try to optimise and destroy a as soon as it is not needed any more. Can I rely on the above function always printing 123 ? 回答1: The

问题 Is the destruction of automatic objects (objects created on the stack) guaranteed to be executed not before they go out of scope? To clarify: #include <iostream> class A { public: A() { std::cout << "1"; } ~A() { std::cout << "3"; } }; void test123() { A a; std::cout << "2"; } To print "2" , a is not required any more, so theoretically the compiler could try to optimise and destroy a as soon as it is not needed any more. Can I rely on the above function always printing 123 ? 回答1: The

问题 Is the destruction of automatic objects (objects created on the stack) guaranteed to be executed not before they go out of scope? To clarify: #include <iostream> class A { public: A() { std::cout << "1"; } ~A() { std::cout << "3"; } }; void test123() { A a; std::cout << "2"; } To print "2" , a is not required any more, so theoretically the compiler could try to optimise and destroy a as soon as it is not needed any more. Can I rely on the above function always printing 123 ? 回答1: The

问题 function jjj(asi) { asi=3; } jjj(); console.log(asi); Here I am thinking that asi is a global variable but while running this code it is giving that asi is not defined. As per the books and official doc I have studied that if you mention the variable name without the keyword var then it becomes global so I think same rule applies to asi variable also 回答1: here I am thinking that asi is a global variable but while running this code it is giving that asi is not defined It would be creating an

问题 function jjj(asi) { asi=3; } jjj(); console.log(asi); Here I am thinking that asi is a global variable but while running this code it is giving that asi is not defined. As per the books and official doc I have studied that if you mention the variable name without the keyword var then it becomes global so I think same rule applies to asi variable also 回答1: here I am thinking that asi is a global variable but while running this code it is giving that asi is not defined It would be creating an

问题 function jjj(asi) { asi=3; } jjj(); console.log(asi); Here I am thinking that asi is a global variable but while running this code it is giving that asi is not defined. As per the books and official doc I have studied that if you mention the variable name without the keyword var then it becomes global so I think same rule applies to asi variable also 回答1: here I am thinking that asi is a global variable but while running this code it is giving that asi is not defined It would be creating an

问题 Firstly if have only one form on page, like: <form class="form-horizontal" name="formCreateCtb"> ... Then i can easily access it in my controller in following way: $scope.formCreateCtb.$setPristine(); // reset form validation But as soon as i added second form on page, like: <form class="form-horizontal" name="formCreateCtb"> ... <form class="form-horizontal" name="formCreateCtbs"> ... Then i can't access second form in scope like previosly: $scope.formCreateCtb.$setPristine(); // still work

问题 Firstly if have only one form on page, like: <form class="form-horizontal" name="formCreateCtb"> ... Then i can easily access it in my controller in following way: $scope.formCreateCtb.$setPristine(); // reset form validation But as soon as i added second form on page, like: <form class="form-horizontal" name="formCreateCtb"> ... <form class="form-horizontal" name="formCreateCtbs"> ... Then i can't access second form in scope like previosly: $scope.formCreateCtb.$setPristine(); // still work

问题 Firstly if have only one form on page, like: <form class="form-horizontal" name="formCreateCtb"> ... Then i can easily access it in my controller in following way: $scope.formCreateCtb.$setPristine(); // reset form validation But as soon as i added second form on page, like: <form class="form-horizontal" name="formCreateCtb"> ... <form class="form-horizontal" name="formCreateCtbs"> ... Then i can't access second form in scope like previosly: $scope.formCreateCtb.$setPristine(); // still work

问题 I'm trying to access the h variable in the inner class but an error keeps showing up "Cannot assign a value to final variable h ". I tried quick-fix and it instructed me to "Transform h to final one element array".What does that mean? int Update () { final int h; SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(this); preferences.registerOnSharedPreferenceChangeListener(new SharedPreferences.OnSharedPreferenceChangeListener() { @Override public void