"unary operator expected" error in Bash if condition
May 14, 2021 · bash script: [: ==: unary operator expected even though I'm almost sure my conditional syntax is right Hot Network Questions Explorer on Mars is running out of air, …
What's the significant use of unary plus and minus operators?
Jan 26, 2016 · The Unary -operator converts its operand to Number type, and then negates it. (per the ECMAScript spec) In practice, Unary -is used for simply putting negative numbers in …
c# - What does the unary plus operator do? - Stack Overflow
Feb 22, 2018 · One thing the built-in unary + does is turning lvalue into an rvalue. For example, you can do this. int x; &x; but you can't do this &+x; :) P.S. "Overloading" is definitely not the …
A positive lambda: '+[]{}' - What sorcery is this? - Stack Overflow
This is important as the unary operator + has a set of built-in overloads, specifically this one: 13.6 Built-in operators [over.built] 8 For every type T there exist candidate operator functions of the …
error: invalid type argument of ‘unary *’ (have ‘int’)
Mar 28, 2011 · cout << **p; //error: invalid type argument of `unary *' //peeking too deeply into p, you better believe that's a paddlin. ELI5: The master puts a shiny round stone inside a small …
What is the purpose of the unary plus (+) operator in C?
Jul 10, 2011 · The result of the unary + operator is the value of its (promoted) operand. The integer promotions are performed on the operand, and the result has the promoted type. …
What's the purpose of the + (pos) unary operator in Python?
May 29, 2013 · For symmetry, because unary minus is an operator, unary plus must be too. In most arithmetic situations, it doesn't do anything, but keep in mind that users can define …
What is unary + used for in Javascript? - Stack Overflow
Mar 29, 2012 · The unary + operator, when used on types other than string, will internally attempt to call valueOf() or toString() (in that order) and then attempt to convert the result to a number. …
bash - [: -eq: unary operator expected - Stack Overflow
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Is a unary/recursive relationship strong/identifying or weak/non ...
Unary/recursive relationship: Most relationships are binary, in that they connect two separate entities. For example, the relationships between Course and Class, and between Room and …