wrapper

问题 I'm implementing some data structures, each supporting a set of commands such as INSERT value . I've used a tokenizer to generate a vector that holds each word/value. I want to be able to output to a .txt file the time every function call took, plus what the function returned if it does return something. For example, if the command is INSERT AVLTREE 4 , I want to just output the time calling avl.insert(4) took. If the command is SEARCH AVLTREE 4 , I want to output the time calling avl.search

问题 This question already has answers here : Why is 128==128 false but 127==127 is true when comparing Integer wrappers in Java? (6 answers) How to properly compare two Integers in Java? (10 answers) Closed 10 months ago . My Question about Wrapper classes. Case 1: I'm Declaring two Integer variables and assigning same values 127 , and i'm printing both hashCode. It's Generated same hashCode and result will be printed true . But In Case 2: Generated the Same hashCode but result will be printing

问题 From a practical point of view, how can you adapt the domain model to the MVC pattern? For example, could I use some wrapper classes? 回答1: They aren't really related. MVC is a design pattern for separating the concerns of storing data (model), presenting various views of the data (view), and interacting with that data (controller). While it may be a "design" pattern, it is really about the design of code. The views are usually, but not necessarily used for GUIs. Domain-Driven Design is a

问题 This question already has answers here : Why won't dynamically adding a `__call__` method to an instance work? (2 answers) Closed 11 months ago . I have a wrapper class similar to this (strongly simplified) example: class wrap(object): def __init__(self): self._data = range(10) def __getitem__(self, key): return self._data.__getitem__(key) I can use it like this: w = wrap() print w[2] # yields "2" I thought I could optimize and get rid of one function call by changing to this: class wrap

问题 I wrote a C extesion for Python and the module is compiled in a .so file successfully. However when I am trying to use the wrapped C function in Python side (a test code in python that calls the wrapped C function) I get the following ImportError ImportError: /home/username/newModule.cpython-36m-x86_64-linux-gnu.so: undefined symbol: dgetri_ I am pretty sure that undefined symbol: dgetri_ in the import error is because the generated .so file did not find link to LAPACK library. So my question

问题 This question already has answers here : Closed 7 years ago . Possible Duplicate: Why does 128==128 return false but 127==127 return true in this code? The below piece of Java code returns true Integer i1=1; Integer i2=1; System.out.println(i1==i2); So the way we have concept of String literal constant pool in Java, do we have the similar concept in case of wrapper classses in Java also? 回答1: Java also has Integer pool for small integers between -128 to 127 so it will behave same for Integer

问题 I have been tasked with removing RogueWave components from a legacy C++ codebase. To do so, I am attempting to build wrappers around the existing components, make sure that the code functions the same, and then choose a different library like boost to stick into the wrappers. One of the problems I am coming against is that much of the codebase expects pointers to RogueWave objects. I can create a dummy Wrapper Object class that points to the original RogueWave object, but I cannot figure out

问题 I'm especially interested in specificity_at_sensitivity. Looking through the Keras docs: from keras import metrics model.compile(loss='mean_squared_error', optimizer='sgd', metrics=[metrics.mae, metrics.categorical_accuracy]) But it looks like the metrics list must have functions of arity 2, accepting (y_true, y_pred) and returning a single tensor value. EDIT: Currently here is how I do things: from sklearn.metrics import confusion_matrix predictions = model.predict(x_test) y_test = np.argmax

问题 This question already has answers here : Closed 8 years ago . Possible Duplicate: Wrapper class and == operator It seems as if object equality operator for wrapper classes produces different results depending on whether the wrapped value is in byte range or not. Here is a code snippet to demonstrate this behavior: System.out.println("smaller than byte"); Integer i1 = 1; Integer i2 = 1; if (i1 == i2) System.out.println("same"); if (i1 != i2) System.out.println("not same"); System.out.println(

问题 ( Note: I'm looking for really any suggestions on the right search terms to read up on this category of issue. "Object-relational-mapping" occurred to me as a place where I could find some good prior art...but I haven't seen anything quite fitting this scenario just yet.) I have a very generic class Node , which for the moment you can think of as being a bit like an element in a DOM tree. This is not precisely what's going on--they're graph database objects in a memory mapped file. But the