lambda2 | A C14 Lambda Library | Function As A Service library
kandi X-RAY | lambda2 Summary
kandi X-RAY | lambda2 Summary
This is an implementation of the simple C++14 lambda library described in this post. It has no dependencies and consists of a single header. See the documentation for more information.
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QUESTION
I am having a strange error still could not figure it out.
...ANSWER
Answered 2021-Jun-15 at 08:22The shape of b is (1,10) and the shape of the expression is (10). It will work if you do
QUESTION
The problem is the following: I got a png file : example.png
that I filter using chan vese of
skimage.segmentation.chan_vese- It's return a png file in black and white.
i detect segments around my new png file with
cv2.ximgproc.createFastLineDetector()- it's return a list a segment
But the list of segments represent disjoint segments.
I use two naive methods to polygonize this list of segment:
-It's seems that cv2.ximgproc.createFastLineDetector() create a almost continuous list so I just join by creating new segments:
ANSWER
Answered 2021-Jun-15 at 06:36So I use another library to solve this problem: OpenCV-python
We got have also the detection of segments( which are not disjoint) but with a hierarchy with the function findContours. The hierarchy is useful since the function detects different polygons. This implies no problems of connections we could have with the other method like explain in the post
QUESTION
In terraform, I have a list
...ANSWER
Answered 2021-Apr-29 at 18:22This situation is a typical use-case for the splat operator, [*]. It can behave as a shorthand for accessing the same attribute on every element of a list in order to construct a new list.
For example:
QUESTION
In C++, I want to use a map of functions with different type of input or output.
Do to so, I found that using a map with any type could be a way.
But I get several problems. First, I can not use directly the functions in the map.
However, I can use a lambda function to wrap the functions then use these lambda functions in the map.
But, I get a second problem, I still need to cast with the lambda function which is not a variable. This makes a use from a string variable complicated.
Here is a MWE:
...ANSWER
Answered 2021-Apr-04 at 22:29std::any_cast needs to cast to constructible types. A standard C++ function is neither a type nor constructible (it's just a group of statements given a name [edit: this isn't technically true, but what's going on under the hood is fairly complicated]), but std::function is. One way to get around this is to assign a standard C++ function to an std::function. Here's an example using a std::map like you were using:
QUESTION
#include
#include
std::function makeLambda1(int x) {
return [x] (int y) { return x * y; };
}
auto makeLambda2(int x) {
return [x] (int y) { return x * y; };
}
auto makeLambda3() {
return [] (int y) { return 10 * y; };
}
int main() {
auto lambda1 = makeLambda1(10);
auto lambda2 = makeLambda2(10);
auto lambda3 = makeLambda3();
std::cout << sizeof(lambda1) << " ";
std::cout << sizeof(lambda2) << " ";
std::cout << sizeof(lambda3) << " ";
std::cout << sizeof(int(*)(int)) << std::endl;
}
ANSWER
Answered 2021-Mar-23 at 06:35[1] std::cout << sizeof(lambda1) << " ";
this prints the size of std::function, which is implementation defined.
[2] std::cout << sizeof(lambda2) << " ";
this prints the size of unnamed unique class type instance, which has only one data member - int. The size of such closure is 4 - sizeof(int).
[3] std::cout << sizeof(lambda3) << " ";
this prints the size of unnamed unique class type instance, which has no data members. The size of empty class cannot be empty, and it is just 1 byte. See EBO, The size of any object or member subobject (unless [[no_unique_address]] -- see below) (since C++20) is required to be at least 1 even if the type is an empty class type.
QUESTION
I have a file, included below, that when I compile, I get the error that cv.h file not found. This, I believe, is because I use opencv4 which doesn't support cv.h. I've seen similar posts recommending one to simply downgrade opencv versions, but I don't want to do that.
My question is this:
How do I find what part of the code is dependent on cv.h, so that. I can simply try to update it for opencv4 compatibility?
file:
...ANSWER
Answered 2021-Jan-08 at 21:56This is the C-interface to OpenCV, not C++. Some of the types seem to be still available, though, with "_c.h" header files, if you still want to use the C code and don't want to convert it to the C++ types and interface.
I managed to get most of your code parsed with OpenCV 4.2 and:
QUESTION
I want to chain/compose multiple lambdas to a new lambda. When calling the new lambda with parameters it should call the original lambdas with these parameters. This lambda chaining does work well when the parameters are just copied but when I want to modify them perfect forwarding does not work:
...ANSWER
Answered 2020-Dec-31 at 13:18auto argsTpl = boost::hana::make_basic_tuple(std::forward(args)...); does copy (move) of arguments, so you only mutate the copy.
You need std::forward_as_tuple equivalent for boost:
QUESTION
Today I encountered a following Java assignment, and I can't figure out how to get past type erasure.
The task is to create a generic InputConverter class, which takes an input of type T and converts it using chain of multiple functions received as a method argument. It has to support a following notation:
...ANSWER
Answered 2020-Nov-19 at 23:42Problem
You would need to chain the generics for each number of expected functions and chain the generic parameters as on the snippet below with five functions:
QUESTION
Got 3 SQS queues and 3 lambdas. Lambda1 sends 50 messages to queue1, lambda2 picks up a message from queue1 and sends to queue2, lambda3 picks up off queue2 and relays to queue3. Queues defined via cdk:
...ANSWER
Answered 2020-Oct-16 at 13:35In this code:
QUESTION
I have two lambdas, one (lambda1) is in VPC1 and the other (lambda2) is in VPC2. VPC1 has NAT gateway configured which means the lambda has access to internet. VPC2 doesn't have NAT gateway so the lambda in VPC2 doesn't have any internet access.
I am invoking lambda2 from lambda1 synchronously and it should work because lambda1 has NAT gateway and lambda2 has default endpoint which is open to public. Now my question is how can lambda1 receive response from lambda2? Does the response from lambda2 go through internet? If yes, lambda2 doesn't have internet access which means the response is not able to go to lambda1.
Am I understanding correct?
...ANSWER
Answered 2020-Sep-29 at 08:01Now my question is how can lambda1 receive response from lambda2?
You invoke the lambda 2 from internet, and the response will also go back to you through the internet.
If yes, lambda2 doesn't have internet access which means the response is not able to go to lambda1.
Lambda2 can't initiate the connection to the internet from a VPC without NAT. But when invoked, it can return a response to the process which invoked it in the first place. It is similar to when you have a load balancer for instances in a private subnets. The instances can return a response to the caller from the internet even though they are in private subnet without access to the internet.
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