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Announcement of class object

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kalyn last edited by

In class. A There's a default designer and a designer with one parameter.
With that. A x(); and that A x; announcements of class object A different actions are carried out. Why?
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1 Reply Last reply
A
amarantha last edited by
A x(); - this is an announcement of the function. x which returns the result to the type A♪
In C and C++, functions can be declared in t and within functions, for example
```
int main() {
  int f(); // объявили функцию, которая будет определена ниже.
  return f();
}
int f() { return 0; }
```
To declare the variable, use the figure brackets:
```
A x{};
```
Or just use it. A x;♪
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Destruction of the production class object thus object-Release()
Software Programming • c++ • • Kadir

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Strictly speaking in the method release You can just write. delete this;♪ But you have to be 100% sure that:Object established with assistance new(grunts) new[], not placement new♪ not a local steak facility, not a global facility, not a class member)Method release The last one.Part of method releaseafter line delete this; Not operating. No data from the facility.No one will use this in any way after delete this;(grunting) this c nullptrwith another index, of type)If these demands are met, it'll work properly. Method release That's what he's supposed to do. Although I wouldn't write that. First of all, because delete this; It's a dangerous and indecent design. Second of all, you're a two-grade one-time functionality. Creating myDeviceand destruction object♪ I'm not 100% sure, but I think there's a violation of the principle. https://ru.wikipedia.org/wiki/GRASP#5._.D0.92.D1.8B.D1.81.D0.BE.D0.BA.D0.BE.D0.B5_.D0.B7.D0.B0.D1.86.D0.B5.D0.BF.D0.BB.D0.B5.D0.BD.D0.B8.D0.B5_.28High_Cohesion.29.5B2.5D (I'll be fined if it's not.)Where such an approach would be more logical:IObject* object = myDevice->сreate(); //... myDevice->release(object); Or like,std::shared_ptr<IObject> object = myDevice->сreate();
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How's it right to write commites?
Software Programming • c++ git github • • zymir

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There may be several files in every comme. In your case, when you're uploading a git-ready project, it's accepted to add all the files with comment. Initial commit or something like that.In the future, you choose a policy of addition. It is possible, for example, to complete the task and record all the changes. This practice is not considered to be very convenient for subsequent reviews, as there are too many files in each room.There's an approach. microcompmites♪ You're doing a part of the job, covering her tests, you're compiling everything-- time to record changes. Usually there's not a lot of files in that commite.If you can see that the name of the method is not a very good description of his work, you can rename it. That's it. de facto a lot of files, because the method can be triggered from dozens of places. It's also made by a committ.There's also an intermediate approach when you might have some resolute subpoenas in one room. If the team doesn't mind, that's the way.The postage does not add any convenience. It's better to come when you feel you've completed another phase of the task.CommentsThere's a need to write comments to the comme. It happens that people write trottoms so that the comment is not empty.That's not good. Usually, they recommend a brief (up to 50 symbols) description of the substance of the resolute sub-task. This can be facilitated by further review.If 50 symbols don't fit, do a short heading, empty line, and then write a detailed text. Git understands that such headings are in the commentary and will only show them in history. If you need a detailed description of the commite, you can always read it.The width of the detailed text shall not exceed 72 symbols. It's called https://stackoverflow.com/questions/2290016/git-commit-messages-50-72-formatting ♪ On Habre. https://habr.com/ru/post/416887/ recommend how to write comments.
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How to calculate the meaning of expression through a diversion
Software Programming • c++ math rites • • chanisef

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For example, http://ideone.com/99uRIM :#include <iostream> #include <iomanip> using namespace std; const int N = 5; double A[N] = { 1, 2, 3, 4, 5 }; double calc(double x, double* a, int n = 0) { if (n == N-1) return a[n]; return calc(x,a,n+1)*x+a[n]; } double series(double x, double* a) { double sum = 0.0; for(int i = N-1; i >= 0; --i) sum = sum*x + a[i]; return sum; } int main(int argc, const char * argv[]) { for(double x = 0.0; x < 5.0; x += 0.5) { cout << setw(8) << calc(x,A) << " " << setw(8) << series(x,A) << endl; } } series Computation to the forehead for comparison. ♪ ♪
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Help me meet the IC challenge.
Software Programming • c++ c language • • amarantha

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One can be on C++.#include <string> #include <iostream> #include <iomanip> #include <algorithm> #include <functional> using namespace std; bool hasDouble(string s) { sort(s.begin(),s.end()); return unique(s.begin(),s.end()) != s.end(); } int main() { string a, b; cout << "a: "; getline(cin,a); cout << "b: "; getline(cin,b); if (hasDouble(a) && !hasDouble(b)) { sort(b.begin(),b.end()); a.erase(remove_if(a.begin(),a.end(),[](char x){ return isalpha(x); }),a.end()); } else { sort(b.begin(),b.end(),greater<char>()); b.erase(unique(b.begin(),b.end()),b.end()); string s; for(auto c: a) { s += c; if (b.find(c) == string::npos) s += c; } a = s; } cout << endl; cout << "a: " << a << endl; cout << "b: " << b << endl; }
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How to transform JSON into an array of objects of a specific class, being that class has compound attributes?
Software Programming • java android json gson • • nishika

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From JSON presenting by you and the data structure also presented in the question, if we use a standard approach like this:final Gson gson = new Gson(); final Response response = gson.fromJson(json, Response.class); Or this:final Gson gson = new Gson(); final Type type = new TypeToken<List<Post>>() {}.getType(); final List<Post> posts = gson.fromJson(json, type); response.setMPosts(posts); It won't work.In the first case an error will appear: Expected BEGIN_OBJECT but was BEGIN_ARRAY, why, obviously JSON does not start with an object and a vector; already in the second, all attributes will be null or with its default value, that is why Gson does not support by default the nomenclature policy adopted in these objects.There are a few ways to do this and I'll show you just one.use http://google-gson.googlecode.com/svn/trunk/gson/docs/javadocs/index.html in attributes with name outside the supported pattern;create a custom deserializer. Here's how it works: https://sites.google.com/site/gson/gson-user-guide#TOC-Writing-a-Deserializer ;use http://google-gson.googlecode.com/svn/trunk/gson/docs/javadocs/com/google/gson/FieldNamingStrategy.html and define the nomenclature strategy used in its attributes, a DE-PARA between the attributes in the java objects and those in JSON;rename the attributes of your objects to reflect some standard approach already supported by Gson. See this link: http://google-gson.googlecode.com/svn/trunk/gson/docs/javadocs/com/google/gson/FieldNamingPolicy.html ;How has not been cited by you which approach is already using to deserialize to the list and Posts, I will show as an example the third approach, creating a strategy of self-nomenclature.I am considering only the attributes shown in the question, if there are others who do not follow the pattern you should consider in its implementation.To have this own strategy we will implement the interface http://google-gson.googlecode.com/svn/trunk/gson/docs/javadocs/com/google/gson/FieldNamingStrategy.html , the implementation of the method http://google-gson.googlecode.com/svn/trunk/gson/docs/javadocs/com/google/gson/FieldNamingStrategy.html#translateName(java.lang.reflect.Field) will be more or less like this:final String fieldName = f.getName(); if (fieldName.equalsIgnoreCase("mAnexos")) { return "anexos"; } final Class<?> declaringClass = f.getDeclaringClass(); final String className = declaringClass.getSimpleName().toLowerCase(); return className + "" + fieldName.toLowerCase(); The attribute mAnexos is the only one who does not share the same pattern of the other attributes, so if it is he we will return Annexes, the name of the attribute in JSON. The others already follow the same pattern, i.e. the name of the class in which they are in separated low box by one of the attribute name.You can implement the portfolio in several ways, an example in Java 8 would be this:final FieldNamingStrategy strategy = (final Field f) -> { final String fieldName = f.getName(); if (fieldName.equalsIgnoreCase("mAnexos")) { return "anexos"; } final Class<?> declaringClass = f.getDeclaringClass(); final String className = declaringClass.getSimpleName().toLowerCase(); return className + "_" + fieldName.toLowerCase(); }; In other versions of Java you can implement this way (with anonymous class):final FieldNamingStrategy strategy = new FieldNamingStrategy() { public String translateName(final Field f) { final String fieldName = f.getName(); if (fieldName.equalsIgnoreCase("mAnexos")) { return "anexos"; } final Class<?> declaringClass = f.getDeclaringClass(); final String className = declaringClass.getSimpleName().toLowerCase(); return className + "_" + fieldName.toLowerCase(); } }; After implementing the nomenclature strategy, we can use it this way:final Gson gson = new GsonBuilder().setFieldNamingStrategy(strategy).create(); final Type type = new TypeToken<List<Post>>() {}.getType(); final List<Post> posts = gson.fromJson(json, type); // substitua "json" pelo o json que você precisa deserializar final Response response = new Response(); response.setMPosts(posts); Can also create another object that implements http://google-gson.googlecode.com/svn/trunk/gson/docs/javadocs/com/google/gson/FieldNamingStrategy.html , it is at your discretion.
No counter-aller class object?
Software Programming • php mvc router oscomper • • carriann

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Imports are performed during the compilation and therefore do not affect the names of dynamic classes, functions or constants. https://www.php.net/manual/ru/language.namespaces.importing.php For the Dynamic Classes, you need to describe the name space yourself:$namespace = 'routetest\\Controllers\\'; $className = $namespace . $controller; $obj = new $className;
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This program needs to reduce or change the bool try code block.
Software Programming • c++ • • gionna

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8 clear checks may be replaced by the following cycle:std::pair<int, int> deltas[] = {{+1, -2}, {+2, -1}, {+2, +1}, {+1, +2}, {-1, +2}, {-2, +1}, {-2, -1}, {-1, -2}}; for (auto[delta_y, delta_x] : deltas) { if (check(y + delta_y, x + delta_x, filled)) { hody[filled - 1] = x + y * 8; return true; } }
An example of replicating a line on C: Why are we doing this through the mass?
Software Programming • c++ c language • • irl

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Actually, on the contrary, t[i] = s[i] We're working with the masses like the indexes (if they were masses). Established operator [] returns the element by applying the deflection to the indicator and by using the equivalent result *(t + i) = *(s + i)♪
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How to assign the object values in one method, the object in another method if they are one class
Software Programming • c++ objects methodes • • Anderson

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No way. ob This is a local temporary facility that will be removed after the challenge. func1 Unless you can make it global, or you can get it back from a value function like that.//file1.h Class func1() { Class ob; ob.set(); return ob; } //file2.h void func2() { Class ob2 = func1(); }
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Create an object from another class
Software Programming • java objec languaget orientati • • derk

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Instead:Endereco e = new Endereco(); Do it.this.endereco = new Endereco(); You forgot to assign the new instance to the class attribute.
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We need to count the amount of arithmetic progress through a classroom.
Software Programming • c++ c++11 visual c+++ • • Saumya

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Like Harry said, "A sum Who will be?♪Decision: simply add the first line operator() summation sum += a1and may also be obtained through a function getSum()It is also possible to take a lesson into an additional function and each challenge. operator() Forced sum and count♪void operator()(int a1, int d, int n) { count = 0; sum = 0; nextTerm(a1, d, n); } Functions nextTerm Clearly, we need to make her look at her. operator()Decommissioning programme on challenge func(2, 3, 15) and func(2, 3, 3): P.s. if you want to get back in order, put it in. cout before the challenge nextTerm
Concurrent.futures and Class object
Software Programming • python python 3.x http classes c languageompetition • • Analeea

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Your problem is that when you create a task in your Executor you are calling the function when you use the expression run_single(). In this case the question is not very well placed, or that it has fragments of its code that do not allow to see the problem itself - they are part of it, the program would call the function and the return value of it is that it would be passed to the call to the Executor. map - and hence your error comes: the function requires a positional parameter (state), which is not passed.What you should do is pass the function itself as a parameter to the Executor - which then takes care of calling it inside a separate thread. For this, you should not place parentheses after the function name (which in Python makes it treated like any other object and simply passed as parameter).In summary, just rewrite your executor call line as:res = executor.map(run_single, states) Notice I removed the sorted also - the executor has no way to guarantee the order in which each of the tasks will be processed, then try to order entry list can only pass you the false impression that the tasks would be performed in some specimen order. It is better to make clear that this order is arbitrary.(The name of the class is also wrong within run_single - It must be Processor, no Geocode)And finally, you're creating a new connection to the bank for every task you're running - in general this is not a good practice - creating a connection to the bank is a relatively costly task - the best thing is to use some kind of pool of connections, or use only a global connection and create a cursor from it within your class.
How many classes can I put in one code?
Software Programming • c sharp classes namespac languagee • • irl

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As many as you like. There is no theoretical limit. I can assure you that you will have other problems before reaching any technical limit (which will be more by memory limit available for the compiler, and we already have a lot).The problem is you're thinking the wrong way. You must learn to organize code. Understand the problem and make the code as suitable as possible to solve it. Learning this takes a long time, needs a lot of dedication, and it's a lot harder than people imagine. Doing any way and getting to work is easy, writing quality code and that lasts is a lot more complicated, and the observation that I have is that most people who are starting lately are not learning this because they just want to see the result, no matter how. In the long run that doesn't work.You don't have to put another class there. You can create another file with the new class. Of course, it depends on the case, you will have to learn when placing in the same file or not.But if you want to insist you have to put the class inside the block of namespace, I it is probably possible to put out, but it is unlikely that I wanted this. You may even want to create another namespace out. Or even cheer them up.You can repeat the namespace, he's just a last name. Even in different files all types that use the same name namespace They'll be part of it.It would be nice to learn some https://pt.stackoverflow.com/q/31646/101 to go organizing the code.
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Gtkmm: Even if you set the font of TextView to monospace, the space width will not be fixed.
Software Programming • c++ c language gtk • • rielyn

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I've tried it, but I think it's a "font problem" as my conclusion.I wrote the following source code.I'm sorry for C++, so please forgive in Python (laughs)Well, if you know GTK, you can understand which language.# coding: utf-8 import gi gi.require_version('Gtk', '3.0') gi.require_version('PangoCairo', '1.0') from gi.repository import Gtk, PangoCairo, Pango TEXT = '''int main(void) { if(true) { {} } }f } ''' class App(Gtk.Application): def init(self, **kwargs): super().init(**kwargs) #self.font_desc = None self.font_desc = Pango.FontDescription.from_string('Monospace 10') def do_activate(self): builder = Gtk.Builder.new_from_string(''' <interface> <object class="GtkWindow" id="window"> <property name="default-width">400</property> <property name="default-height">300</property> <child> <object class="GtkBox" id="vbox"> <property name="visible">true</property> <property name="orientation">vertical</property> <property name="homogeneous">false</property> <child> <object class="GtkButton" id="button"> <property name="visible">true</property> <property name="label">Font</property> <signal name="clicked" handler="on_clicked" /> </object> </child> <child> <object class="GtkPaned" id="paned"> <property name="visible">true</property> <property name="orientation">vertical</property> <child> <object class="GtkDrawingArea" id="drawing_area"> <property name="visible">true</property> <signal name="draw" handler="on_draw" /> </object> <packing> <property name="shrink">true</property> <property name="resize">true</property> </packing> </child> <child> <object class="GtkTextView" id="text_view"> <property name="visible">true</property> <property name="monospace">true</property> </object> <packing> <property name="shrink">true</property> <property name="resize">true</property> </packing> </child> </object> <packing> <property name="expand">true</property> <property name="fill">true</property> </packing> </child> </object> </child> </object> </interface> ''', -1) for obj in builder.get_objects(): if isinstance(obj, Gtk.Buildable): setattr(self, Gtk.Buildable.get_name(obj), obj) builder.connect_signals(self) self.text_view.get_buffer().set_text(TEXT) #self.text_view.get_buffer().insert_markup(self.text_view.get_buffer().get_start_iter(), '<span font_desc="Ubuntu Mono 10">' + TEXT + '</span>', -1) self.window.set_application(self) self.window.present() def on_draw(self, widget, cr): cr.save() layout = widget.create_pango_layout(TEXT) if self.font_desc is not None: layout.set_font_description(self.font_desc) PangoCairo.show_layout(cr, layout) cr.restore() def on_clicked(self, button): dialog = Gtk.FontChooserDialog(modal=True, transient_for=self.window, destroy_with_parent=True) response = dialog.run() if response != Gtk.ResponseType.OK: dialog.destroy() return self.font_desc = dialog.get_font_desc() print('font = %s.' % repr(self.font_desc.to_string()), flush=True) dialog.destroy() self.drawing_area.queue_draw() if name == 'main': App().run() ubuntu20.10 Comment }''f')It changes just by adding.to tryGtkDrawingAreaI tried to draw in Pango, but as you can see the same phenomenon,GtkTextViewIt seems to be a low-layer Pango problem rather than a problem.HomeGtkDrawingAreaYou can change the font with a button, so you can choose "Ubuntu Mono 10". As you can see, it is displayed without problems.By the way, like a comment on the source codeGtkTextViewEven if you specify "Ubuntu Mono 10" font explicitly, it will be displayed without problems.Also, there is no problem with "VL goth 10" instead of "Ubuntu Mono 10".I think that I can try it in other environments ..., and I thought that I could move it in Windows msys2. There is no problem with the default Monospace font.However, since the font is different depending on the environment, it is only possible to specify inside the program, so it is important to choose the font to the user at all.If ubuntu is also an environment of the questioner, you may want to contact the ubuntu community.
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Search object by PYTHON Class attribute
Software Programming • python python 3.x classes • • Duquan

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This search is certainly feasible, but there is no "ready" implementation in Python to do so. Python has no way of knowing a priori of the existence of the class Pessoa, neither of which each instance has an attribute __cpf.In other words, you need to write the search logic on your own.As an example, you could put all people in a container, as a list:pessoas = [pessoa1, pessoa2] So you can iterate about this list and find a specific person comparing the attribute __cpf of each person with the CPF you are looking for (note that the CPF is a string, a numerical value will not work with points and crosses):for p in pessoas: if p.__cpf == '000.000.000-00': print('Pessoa encontrada:', p) Generalizing as a function:def busca_cpf(lista_pessoas, cpf_busca): for pessoa in lista_pessoas: if pessoa.__cpf == cpf_busca: return pessoa

Announcement of class object

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