equality-operator Questions
2
In rust, is there a version of f32 / f64 that implements Eq?
The only reason I can see for f32 / f64 not implementing Eq is that NaN != NaN.
Potential ways such a type could behave:
The type could...
Chon asked 18/8, 2022 at 20:50
5
Solved
I have a struct that's defined like this:
struct Vec3 {
float x, y, z;
};
When I attempted to use std::unique on a std::vector<Vec3>, I was met with this error:
Description Resource ...
Fabyola asked 25/3, 2012 at 1:11
7
Solved
Precondition: Consider such a class or struct T, that for two objects a and b of type T
memcmp(&a, &b, sizeof(T)) == 0
yields the same result as
a.member1 == b.member1 && a.memb...
Ascender asked 4/3, 2015 at 15:31
4
Solved
Note: it has been suggested that this question duplicates Can I compare int with size_t directly in C?, but the question here specifically asks about comparing size_t with a negative value. F...
Siegel asked 17/4, 2023 at 13:6
4
Solved
What is the difference between the comparison operators == and === in Kotlin?
class A {
var foo = 1
}
var a1 = A()
var a2 = A()
println(a1 == a2) // output false
println(a1 === a2) // output f...
Gas asked 14/7, 2018 at 14:58
4
Solved
My application needs to compare Series instances that sometimes contain nans. That causes ordinary comparison using == to fail, since nan != nan:
import numpy as np
from pandas import Series
s1 = ...
Underside asked 26/8, 2013 at 21:37
10
Solved
For my unittest, I want to check if two arrays are identical. Reduced example:
a = np.array([1, 2, np.NaN])
b = np.array([1, 2, np.NaN])
if np.all(a==b):
print 'arrays are equal'
This does not w...
Erelia asked 22/5, 2012 at 21:18
12
Solved
Why is === faster than == in PHP?
Seger asked 8/3, 2010 at 13:14
2
Solved
According to cppreference, std::type_info::operator!= gets removed with C++20, however, std::type_info::operator== apparently remains.
What's the reasoning behind? I might agree on comparing for i...
Vudimir asked 10/10, 2019 at 9:39
1
Solved
string s;
bool b[] = {s=="", s==s.c_str(), s.c_str()==""};
sets
b[] = {true, true, false};
why is b[2] false?
If A==B and A==C, should that not imply B==C?
Irrawaddy asked 17/10, 2019 at 16:55
48
Solved
I'm using JSLint to go through JavaScript, and it's returning many suggestions to replace == (two equals signs) with === (three equals signs) when doing things like comparing idSele_UNVEHtype...
Bateman asked 11/12, 2008 at 14:19
3
Solved
Why is [] !== [] in JavaScript?
I read through https://developer.mozilla.org/en-US/docs/Web/JavaScript/Equality_comparisons_and_sameness but I could not find anything that explains this.
Ed...
Unkindly asked 28/10, 2016 at 21:10
6
Solved
A few weeks ago, I have read this thread Is < faster than <=? about comparison operators in C. It was said that there is no difference in the performance between < and <= as they are in...
Leavis asked 11/9, 2012 at 17:21
15
Solved
I'm learning about operator overloading in C++, and I see that == and != are simply some special functions which can be customized for user-defined types. My concern is, though, why are there two s...
Slowly asked 13/6, 2016 at 22:14
2
Solved
I'm curious to know why
null == undefined
returns true but
null >= undefined
returns false
Is the inclusion of the greater than operator coercing the values differently?
Tymothy asked 3/12, 2015 at 0:38
1
Solved
Why does {} == false evaluate to false while [] == false evaluates to true in javascript?
Sheetfed asked 16/1, 2015 at 17:16
7
Why does the following statement return false in JavaScript?
new String('hello') === new String('hello')
Anoxemia asked 3/9, 2014 at 15:0
3
Solved
I am developing an application in Android using Eclipse. I wrote the following code and in tests the first and third "if" block is not reachable. Why?
When I add a leading zero to a number, the eq...
Magnesite asked 5/5, 2012 at 11:40
4
Solved
In a question regarding the use of typeid is C++, I suggested it could be used to compare types in objects comparison. I haven't seen it done much, but I had Java's equals in mind.
Looking into Ja...
Viewing asked 20/7, 2011 at 19:33
2
Solved
Possible Duplicates:
Difference between == and === in JavaScript
Javascript === vs == : Does it matter which “equal” operator I use?
What's the difference between == and ...
Urbanize asked 16/3, 2011 at 9:40
9
Solved
int main (int argc, **argv)
{
if (argv[1] == "-hello")
printf("True\n");
else
printf("False\n");
}
# ./myProg -hello
False
Why? I realize strcmp(argv[1], "-hello") == 0 returns true....
Actinomycete asked 14/10, 2010 at 13:27
2
Solved
What is the difference between == and === in JavaScript? I have also seen != and !== operators. Are there more such operators?
Weinberg asked 7/2, 2009 at 11:53
1
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