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问题 A class template can have multiple parameters that all have defaults. template<typename UnderlyingT0 = int, typename UnderlyingtT1 = long, typename StringT = std::string> struct options; Instatiating the template with just default parameters is easy: options<> my_default_options; But what if I want to change a subset of parameters? options<int, int, std::wstring> wstring_options; It is not obvious that int is a default for the first parameter while for the second it isn't. Is there something

问题 Given this code: void main() { int x; cout << x; system("pause"); } When I debug this piece of code, it always prints -858993460A. I read that its because VS set this as default value for Unitialized vars. But I also read that in release mode, this should get random value. But everytime I run this code in release mode I get 1772893972A , which Is not changing -> its not random. What is this? Why do I get this value? 回答1: The main is not the real entrypoint of the executable, in general the

问题 Closed . This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 3 days ago . Improve this question Now I am doing a android project. The project needs to get the default username and password of Android phone. I don't know how to get the default gmail information of one Android Cell Phone. Can u help me. Thanks. 回答1: You should read about AccountManager to login using the

问题 I understand that one should not use mutable default parameter value in Python (with some exceptions) because this value is evaluated and stored only once when the function is defined, and not each time the function is later called. My understanding of that is this (using the example below; please excuse my imprecise language as I'm just a beginner in Python programming, who's stuck at the Function chapter of my textbook because of this): def f(x = [1, 2, 3]): x.append(4) print(x) f() f() 1)

问题 How to make the country default for regular (unregistered users). But if the buyer has a personal account and entered the country there, he would not be thrown into default in checkout? I have tried to use WooCommerce: Set country by default in checkout page answer, but it does work for all users logged in and guest… How to set the default country only for unregistered users? 回答1: Use is_user_logged_in() conditional tag as follows: add_filter( 'default_checkout_billing_country', 'change

问题 windows power shell or cmd uses anaconda python instead of the default windows installation how to make them use the default python installation? my os is win 8.1 python 3.6 anaconda python 3.6 回答1: Set the environment path variable of your default python interpreter in system properties. or if this doesn't work do: in cmd C:\Python27\python.exe yourfilename.py in the command first part is your interpreter location and second is your file name 来源： https://stackoverflow.com/questions/44586049

问题 windows power shell or cmd uses anaconda python instead of the default windows installation how to make them use the default python installation? my os is win 8.1 python 3.6 anaconda python 3.6 回答1: Set the environment path variable of your default python interpreter in system properties. or if this doesn't work do: in cmd C:\Python27\python.exe yourfilename.py in the command first part is your interpreter location and second is your file name 来源： https://stackoverflow.com/questions/44586049

问题 C# 7.1 introduces a new feature called "Default Literals" that allows new default expressions. // instead of writing Foo x = default(Foo); // we can just write Foo x = default; For Nullable<T> types, the default value is null , and with the usual usage this works as expected: int? x = default(int?); // x is null int? x = default; // x is null However, when I try to use the new default literal as an optional argument (parameter) of a function, it's not working as expected: static void Foo(int?

问题 Is it possible to not override but merge or append to default plugin configuration in Apache Maven just like it's possible with parent POM configuration elements? 回答1: I'm note sure if i understand your questions correctly: If you like for example to change the configuration of an already defined plugin you should be aware that you need to use the correct execution id which can be looked at during a default build which is printed out in the log output (something like this): [INFO] --- maven

问题 Okay, so, the problem I am facing is this: my mobile Firefox browser is not retrieving the correct values for window.innerWidth , document.documentElement.clientWidth , or even the width of a div styled to take up the whole client window after page load. I am not crazy, my code works just fine in every other browser! For some reason Firefox initializes these values with defaults and then gets the correct values later on. If at any point I interrupt my JavaScript with an alert() , these