30,328 questions
-11
votes
0
answers
61
views
Lambda expression without functional interface and related question [closed]
Can u write lambda function without interface?
In functional interface why only one abstract method for lambda expression can't use for two or more abstract method ?
one of use of lambda expression ...
2
votes
2
answers
86
views
Excel function LAMBDA COUNTIF
=LET(
Business,B6,
All_nationalities,FILTER(Data[Nationality],Data[Business]=Business),
Unique_nationalities,UNIQUE(All_nationalities),
freq,BYROW(Unique_nationalities,LAMBDA(x,COUNTIF(...
- 21
1
vote
2
answers
79
views
Does SONAR's cpp:S5213 rule imply that functions accepting lambdas must be implemented in the .h file?
SONAR's cpp:S5213 rule says that
Template parameters should be preferred to "std::function" when configuring behavior at compile time
We have tried implementing that by replacing std::...
- 6,279
1
vote
0
answers
36
views
Mongodb not available for my AWS Lambda function
I have tried to import mongodb into my lambda function and I keep getting an error message when I attempt to test it. All the recommended resolutions I have seen assume I am working in an environment ...
0
votes
0
answers
17
views
AWS Lambda with pg Pool and RDS Proxy: "Connection terminated unexpectedly" when processing SQS messages
We are using pg Pool in our Lambda function.
Our connectDb function looks like this:
const config = {
database,
user: username,
password,
max: max_pool,
idleTimeoutMillis,
...
0
votes
0
answers
36
views
How do I display my BST using my preorder() and inorder() methods?
I'm doing a programming assignment for my class. One of my programs includes creating a BST with Python within a BST class, and I'm trying to display using preorder() and inorder() functions. My ...
- 1
3
votes
1
answer
101
views
Excel LAMBDA + spill
I've created this LAMBDA function and called it STR2ARR (note: yes, I know there are other functions in Excel that can do this, but I'm trying a concept that I want to use in a bigger LET/LAMBDA ...
- 302
-4
votes
3
answers
132
views
lambda functions as higher-order functions [closed]
I'm learning about higher-order functions, specifically lambda functions in Python. I understand lambda functions to an extent, but a little confused about this lambda higher-order function example.
...
- 15
3
votes
3
answers
114
views
Using Excel Lambda function to count numbers that meet a condition (in conjunction with groupby)
I am trying to write a lambda function for use in a groupby, which counts the total number of failed grades (grades below 6) for each store. However I cannot seem to figure it out.
It seems that there ...
- 41
14
votes
1
answer
352
views
Why does Deducing-This lambda require `this` to be a reference or capturing variables by reference?
Why does this code output garbage on GCC like there is a UB?
auto data = std::vector{1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
auto output = [data](this auto self, size_t i) {
if (i >= 10) {
...
- 4,119
2
votes
0
answers
56
views
Rust lambda parameter passing [duplicate]
I just learned that in rust if you want to pass a reference in lambda:
let player_scores = [
("Jack", 20), ("Jane", 23), ("Jill", 18), ("John", 19),
...
- 31
1
vote
1
answer
61
views
Diff btw "Invoke( lambda )" and directly calling a lambda when we use Google Mock EXPECT_CALL
Since I learnt to use Google Test/Mock framework, I allways used the form to setup an expectation as following:
EXPECT_CALL( mock_obj, mock_method ).WillOnce( Invoke( []() { do_things; } ) );
Few ...
- 2,165
0
votes
1
answer
118
views
Python lambda returns 0 [closed]
Is there a simple way to return 0 with a lambda function using and and or operators?
For example, consider this function to sum elements in an array:
sum = lambda tab: tab == [] and 0 or tab[0] + sum(...
- 1,593
0
votes
0
answers
109
views
Connection Pooling Challenges with MongoDB and AWS Lambda
I'm facing an issue related to MongoDB connections while sending push notifications to users three times a day — morning, noon, and evening.
I have a Lambda-based service that uses SQS and MongoDB. A ...
1
vote
1
answer
115
views
Trying to split parameter pack into two smaller packs using an index sequence and nested lambdas leads to weird compiler behaviors
So I was trying to come up with a way to split a given parameter pack args... into two separate packs args1... and args2... (at some specified index, 3 in this case). I also wanted to minimize the ...
- 23