ternary-operator

问题 Looking for a ternary operator for blade templates @if(Auth::check()) ? yes : no @endif Can't seem to get it to work this works @if(Auth::check()) yes @else no @endif suppose there is not much in it for this example, just curious. 回答1: You are free to use it with {{ }} . {{ Auth::check() ? 'yes' : 'no' }} 回答2: This works: {{ Auth::check() ? 'yes' : 'no' }} 回答3: I know this question was asked a while ago, but this may help somebody. You can now do this in Laravel 5. {{ $variable or "default" }

问题 I've tried playing with clang's extended vectors. The ternary operator is supposed to work, but it is not working for me. Example: int main() { using int4 = int __attribute__((ext_vector_type(4))); int4 a{0, 1, 3, 4}; int4 b{2, 1, 4, 5}; auto const r(a - b ? a : b); return 0; } Please provide examples on how I might make it work, like it works under OpenCL. I am using clang-3.4.2 . Error: t.cpp:8:16: error: value of type 'int __attribute__((ext_vector_type(4)))' is not contextually

问题 gcc 4.7.2 c89 Hello, I am getting the following warning: pointer/integer type mismatch in conditional expression I am compiling with the following CFLAGS -Wall -Wextra fprintf(stderr, "'Failed to open file' Error [ %s ]\n", (errno == 0) ? "None" : strerror(errno)); The program runs ok, but I can't see that the warning is all about. Both "None" and strerror(errno) return a string and not Integer value. And I am comparing errno number to zero. Many thanks for any suggestions, 回答1: Check whether

问题 I got this noted in a middle of a development. Why is the Ternary operator not working inside a method argument? Here it is clearly InputStream or (else) String . class A{ public static boolean opAlpha(InputStream inputStream) { // Do something return true; } public static boolean opAlpha(String arg) { // Do something else return true; } public static void main(String[] args) throws Exception { boolean useIsr = true; InputStream inputStream = null; String arg = null; // boolean isTrue =

问题 This question already has answers here : What does the question mark and the colon (?: ternary operator) mean in objective-c? (13 answers) Closed 5 years ago . I heard about a kind of If statement which use ? and : in C I dont know how to use it and I cant find anything about it. I need to use it in order to shorten my code any help would be appreciated. 回答1: ?: is ternary operator in C (also called conditional operator). You can shorten your code like if(condition) expr1; else expr2; to

问题 Why ternary operator doesn't work with assignment by reference? $obj = new stdClass(); // Object to add $result = true; // Op result $success = array(); // Destination array for success $errors = array(); // Destination array for errors // Working $target = &$success; if(!$result) $target = &errors; array_push($target, $obj); // Not working $target = $result ? &$success : &$errors; array_push($target, $obj); 回答1: Here you go $target = ($result ? &$success : &$errors); Also your example has

问题 Why ternary operator doesn't work with assignment by reference? $obj = new stdClass(); // Object to add $result = true; // Op result $success = array(); // Destination array for success $errors = array(); // Destination array for errors // Working $target = &$success; if(!$result) $target = &errors; array_push($target, $obj); // Not working $target = $result ? &$success : &$errors; array_push($target, $obj); 回答1: Here you go $target = ($result ? &$success : &$errors); Also your example has

问题 I went looking through Raphael.js 's source code to find out how he converted RGB values to HSB. I found out the function he did it in and I was in the process of converting it to Python when I bumped into this nice triple-nested ternary operator: H = (C == 0 ? null : V == r ? (g - b) / C : V == g ? (b - r) / C + 2 : (r - g) / C + 4 ); It threw me for a loop because Python doesn't have the same kind of ternary operator that Javascript does. I spent a while looking over it and eventually

问题 This question already has answers here : Closed 9 years ago . Possible Duplicate: What is the Java ?: operator called and what does it do? hi, may i know what is the java ?: operator called, i am trying to find information on how it works but i do not know what is it called, typing ?: in google dont give a correct result. 回答1: It's the conditional operator. Some people call it the ternary operator, but that's really just saying how many operands it has. In particular, a future version of Java

问题 I've perused the questions on ternary operators vs. if/else structures , and while I understand that under normal circumstances there is no performance loss/gain in using ternary operators over if/else structures, I've not seen any mention of this situation. Language specific to PHP (but any language agnostic details are welcome) does the interpreter reassign values in situations like this: $foo = 'bar' $foo = strlen($foo) > 3 ? substr($foo, 0, 3) : $foo; Since this would evaluate to $foo =