signature

问题 From the C++ Primer 5th Edition, it says: int f(int){ /* can write to parameter */} int f(const int){ /* cannot write to parameter */} The two functions are indistinguishable . But as you know, the two functions really differ in how they can update their parameters. Can someone explains to me? EDIT I think I didn\'t interpret my question well. What I really care is why C++ doesn\'t allow these two functions simultaneously as different function since they are really different as to \"whether

问题 When trying to install a signed application (app-release.apk), a \"Blocked by Play Protect\" alert is shown and the app is not installed. However, an unsigned application (app-debug.apk) can be installed without problems. The error message: Play Protect doesn\'t recognise this app\'s developer. Apps from unknown developers can sometimes be unsafe. Why this error happened? What\'s the solution? 回答1: I found the solution: Go to the link below and submit your application. Play Protect Appeals

问题 This question already has answers here : What should main() return in C and C++? (17 answers) Closed last year . The standard explicitly states that main has two valid (i.e., guaranteed to work) signatures; namely: int main(); int main(int, char*[]); My question is simple, would something like the following be legal? int main(const unsigned int, const char* const* argv); My tests say \'yes\', but I\'m unsure of the answer because am I not overloading main by changing int to unsigned int as

问题 Is there a way to retrieve the signature of the key used to sign an APK? I signed my APK with my key from my keystore. How can I retrieve it programmatically? 回答1: You can access the APK's signing signature like this using the PackageManager class http://developer.android.com/reference/android/content/pm/PackageManager.html Signature[] sigs = context.getPackageManager().getPackageInfo(context.getPackageName(), PackageManager.GET_SIGNATURES).signatures; for (Signature sig : sigs) { Trace.i(

问题 What really are the valid signatures for main function in C? I know: int main(int argc, char *argv[]) Are there other valid ones? 回答1: The C11 standard explicitly mentions these two: int main(void); int main(int argc, char* argv[]); although it does mention the phrase "or equivalent" with the following footnote: Thus, int can be replaced by a typedef name defined as int , or the type of argv can be written as char ** argv , and so on. In addition, it also provides for more (implementation