All Questions
Tagged with generic-lambda or lambda
30,333 questions
0
votes
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30
views
Entity Framework unable to translate IComparable cast of DateTime in OrderBy
In an effort to simplify some of my code, I tried using a switch expression to create a selector for sorting on an EF Core 10 query:
Expression<Func<Foo, IComparable>> selector = sortField ...
- 61
5
votes
1
answer
130
views
MSVC accepts lambda with deleted parameterized ctor while GCC and Clang rejects
I wrote the following program that is accepted by MSVC, but is rejected by both GCC and CLANG. What is the standard compliant behavior?
Live Demo
struct C
{
C(int) = delete;
C(){};
};
decltype([b ...
- 48.8k
5
votes
1
answer
144
views
Lambda with deducing this parameter of unrelated type [duplicate]
A colleague of mine showed me a program with explicit object parameter in a lambda function. The program is accepted by two compilers, but produces a strange result:
struct A {
int a = 2;
...
- 25.1k
1
vote
1
answer
125
views
Is there a difference between 'eval' and sourcing a temporary file?
These two examples accomplish the same thing:
# using eval
var=hello
eval "some_func() { echo $var; }"
some_func # "hello"
# using source
var=hello
source <(echo "...
- 27
3
votes
1
answer
94
views
Accessing a lambda's parameter leads to "Assignment type mismatch: actual type is 'Unit', but 'String' was expected"
I'm trying to pass a click handler to a child function that sends a string back to the parent and updates a mutable value based on the string. I'm getting an error on the function:
Assignment type ...
- 490
0
votes
1
answer
72
views
Array FILTER/TRANSFORM lambda using index
Snowflake supports higher order functions like FILTER or TRANSFORM.
A lambda expression that defines the filter condition on each array element.
The lambda expression must have only one argument ...
- 182k
4
votes
3
answers
348
views
Passing a local reference to a closure
Consider the code below:
for (T &t : some_vector_) {
futures.push_back(thread_pool.submit([&t] { t.do_something(); }));
}
On some iteration i, t is initialized to a reference to a vector ...
- 13.3k
Advice
0
votes
2
replies
85
views
Method-body equivalent of lambda expression
Following is a part of the execution sequence when a middleware gets configured in ASP.NET Core -
// my code
app.Use(some middleware);
// class UseExtensions / namespace Microsoft.AspNetCore.Builder
...
- 8,405
2
votes
3
answers
144
views
How to modify mulitple columns applying if else to multiple pandas dataframe columns
I have a dataFrame with columns Age, Salary and others, if I used:
df['Age'] = df['Age'].apply(lambda x : x+100 if x>30 else 0)
Then I can modify the Age column with the if else condition. Also, if ...
- 33
0
votes
0
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89
views
Datadog APM traces not appearing for AWS Lambda with Node.js despite metrics working
Problem
I'm trying to set up Datadog APM tracing for my AWS Lambda functions (Node.js/TypeScript), but traces are not appearing in the Datadog APM UI. Custom metrics are being collected successfully, ...
1
vote
3
answers
152
views
Pass QString in Lambda Function
I want to pass a QString into a lambda slot-function to modify it further. Unfortunately the QString goes out of scope before reaching the slot, so I cannot append text. How can I ensure that the ...
- 515
1
vote
1
answer
151
views
Why can't I return type byte in lambda expression in Arrays.setAll
I'm trying to implement a lambda function (for educational purposes) to initiate an array to append to the front of potentially encrypted data to save information like salt and initiation vector, ...
- 125
-1
votes
1
answer
54
views
Why are all versions of Lambda@Edge function being modified when I deploy the latest code?
I have a Lambda@Edge function which has 2 versions. Version 1 has non-functional code and version 2 has the latest operational code. What that function does is it fetches an object from an S3 bucket ...
- 459
0
votes
1
answer
59
views
Localstack returning error when trying to provision a dotnet8 lambda
I'm trying to provision a lambda on a free localstack instance. As such, I cannot build the lambda as an image and push it into localstack's ECR because ECR is a paid resource. So I'm taking the ...
- 3
1
vote
1
answer
58
views
Unexpected behavior when replacing arrow-kt partiallyN function with kotlin lambda
I'm working on updating some Kotlin code that depends on arrow-kt. As part of the migration process from arrow 1.2 to 2.x, I need to get rid of arrow partiallyN() functions and replace them with ...
- 1,839