compiler-errors

问题 When trying to compile Python 3.4.3 with gcc (Debian 6.2.1-7) 6.2.1 20161215 I got the following error: Failed to build these modules: _hashlib _ssl When running make again, I got a little more informative output: $ make running build running build_ext INFO: Can't locate Tcl/Tk libs and/or headers building '_ssl' extension gcc -pthread -fPIC -Wno-unused-result -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -Werror=declaration-after-statement -I./Include -I. -IInclude -I/usr/include/x86_64

问题 Another question from a C++ newbie. I'm receiving a compiler error "No match for 'operator=='" for the following block of code void swap(Team t1, Player p1, Team t2, Player p2){ Player new_t1[11]; Player new_t2[11]; for(int i=0; i<11; i++){ new_t1[i] = t1.get_player(i); new_t2[i] = t2.get_player(i); if(new_t1[i] == p1){ new_t1[i] = p2; } if(new_t2[i] == p2){ new_t2[i] = p1; } } cout << "Players swapped."; } Any ideas? 回答1: The compiler doesn't know what it means for the two players to be the

问题 Another question from a C++ newbie. I'm receiving a compiler error "No match for 'operator=='" for the following block of code void swap(Team t1, Player p1, Team t2, Player p2){ Player new_t1[11]; Player new_t2[11]; for(int i=0; i<11; i++){ new_t1[i] = t1.get_player(i); new_t2[i] = t2.get_player(i); if(new_t1[i] == p1){ new_t1[i] = p2; } if(new_t2[i] == p2){ new_t2[i] = p1; } } cout << "Players swapped."; } Any ideas? 回答1: The compiler doesn't know what it means for the two players to be the

问题 This is a follow up to this question Consider the following code #include <variant> int add_(int a, int b){ return a+b; } float add_(float a, float b){ return a+b; } float add_(int a, float b){ return a+b; } float add_(float a, int b){ return a+b; } using Number = std::variant<int, float>; Number add(Number const& lhs, Number const& rhs ){ return std::visit( []( auto& lhs_, auto& rhs_ )->Number { return {add_( lhs_, rhs_ )}; }, lhs, rhs ); } int main(){ Number a = 1.f; Number b = 2.f; Number

问题 I want to extract from Iterable[Try[Int]] a list of all valid values ( Iterable[Int] ) val test = List( Try(8), Try(throw new RuntimeException("foo")), Try(42), Try(throw new RuntimeException("bar")) ) The following is the way to print all valid values from test : for { n <- test p <- n } println(p) // Output // 8 // 42 However, when I tried to save the valid values to list I have received an error: val nums: Seq[Int] = for { n <- list p <- n // Type mismatch. Required: IterableOnce[Int],

问题 I want to extract from Iterable[Try[Int]] a list of all valid values ( Iterable[Int] ) val test = List( Try(8), Try(throw new RuntimeException("foo")), Try(42), Try(throw new RuntimeException("bar")) ) The following is the way to print all valid values from test : for { n <- test p <- n } println(p) // Output // 8 // 42 However, when I tried to save the valid values to list I have received an error: val nums: Seq[Int] = for { n <- list p <- n // Type mismatch. Required: IterableOnce[Int],

问题 First time asking a question here and likely not my last. Problem: The ng-build --prod process cannot finish and errors out in my Angular 8.2.14 app. I am using Firebase and have been able to set it up in my project to a point where I'm receiving the data and passing it to the HTML. When trying to build for production so I can deploy it to Heroku, I receive multiple ERROR in ./src/app/app.module.ngfactory.js errors with Firebase related things not found in a Firebase library mentioned in them

问题 First time asking a question here and likely not my last. Problem: The ng-build --prod process cannot finish and errors out in my Angular 8.2.14 app. I am using Firebase and have been able to set it up in my project to a point where I'm receiving the data and passing it to the HTML. When trying to build for production so I can deploy it to Heroku, I receive multiple ERROR in ./src/app/app.module.ngfactory.js errors with Firebase related things not found in a Firebase library mentioned in them

问题 First time asking a question here and likely not my last. Problem: The ng-build --prod process cannot finish and errors out in my Angular 8.2.14 app. I am using Firebase and have been able to set it up in my project to a point where I'm receiving the data and passing it to the HTML. When trying to build for production so I can deploy it to Heroku, I receive multiple ERROR in ./src/app/app.module.ngfactory.js errors with Firebase related things not found in a Firebase library mentioned in them

问题 I'm getting the following error when I'm loading tidyverse. It was all working fine a few minutes ago when I was running my shinyapp. How should I resolve this? Error: package or namespace load failed for ‘tidyverse’ in loadNamespace(i, c(lib.loc, .libPaths()), versionCheck = vI[[i]]): namespace ‘rlang’ 0.3.0.1 is already loaded, but >= 0.3.1 is required 回答1: I had the same problem but managed to tackle it. You may remove the current version of rlang using the following command: remove