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Why do you need a container std: map? What's he going through with his map?

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chanisef last edited by

Why is there a container map if there hash_map, which is faster? Like std: map better than std:unordered_map'a?
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courtlanda last edited by

There is no " better " or " worse " of the container.
std::map keeps the data in a key-corrected form, unlike std::unordered_map♪ If you need this property, you need it. std::map♪ If not, enough and std::unordered_map♪
(as a result of adhesion, for example, std::map is a function. http://en.cppreference.com/w/cpp/container/map/lower_bound who's not in std::unordered_map.
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Mapping?
Software Programming • javascript html jquery css oils • • Kadyn

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I'm not sure I got your job right. Changed the width of the picture in proportion to the change in the width of the browser window. High, if you need to, figure it out by analogy. http://jsfiddle.net/Deonis/rjbPj/ HTML<div> <p>Изменяйте размер окна</p> <span></span> </div> <img src="http://www.apple-reviews.com/wp-content/uploads/iphone-5.jpg" alt="" /> CSSp { font-size: 16px; color: #900; margin-left: 50px; } JSvar pS = $(window).width() / 100; var imgW = $('img').width(); $(window).resize(function(){ var percentW = $(this).width() / pS; var newWidth = parseInt(imgW / 100 * percentW,10); $('img').css('width', newWidth + 'px'); $('span').text('Текущая ширина картинки: ' + newWidth + 'px'); });
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Class structure
Software Programming • c++ • • Nykeriab

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I'll try the short: there's a thing like that+- namespace♪ It allows for the proclamation, identification and use of functions with the same name and signature if they are in different namspaces. They can be invested and look like,namespace alfa { namespace beta { int fun(); }; int fun(); }; ... alfa::fun(); alfa::beta::fun(); It's two different functions. In doing so, the names of classes (which should have been started) and the list (enum) can be used in this way:class alfa { enum class type{one, two}; class beta { static beta *instance(); }; }; ... alfa::type::one; alfa::beta::instance(); You know, you don't smell like a fortune.
Reading the text file as if
Software Programming • c++ • • Bogopo

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Reading the file is a very strange idea. For starters, the file is easy to read what language or standard library offers. C+++ for file handling http://www.cplusplus.com/reference/fstream/ ♪ For reading - http://www.cplusplus.com/reference/fstream/ifstream/ for the record. http://www.cplusplus.com/reference/fstream/ofstream/ ♪ The simplest option is to read the size of the file, to remembrance the entire size of the file and to count the file completely. For big files, it's unsatisfactory. In this case, a much smaller buffer can be identified and the file read porn, but it will complicate the processing algorithm. After reading the file in the buffer, separate words should be made on the last and in some way (words may be divided only by gaps or take into account any other symbols of the dividers). To count the repetitive words, it's convenient to copy the words from the incoming buffer. std::string, repetitive word counter and container std::set<std::string>♪ Each word shall be added to the container, the boxing function will return the false if the word already exists in the container, thereby increasing the repeater counter. For the alphabetical withdrawal, it is sufficient for the operator to run for On the previous container. This operation will give a list of words in alphabetical order, but there won't be repeated words, all words will be in a single copy.
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How can access classes declared in different source areas?
Software Programming • c++ • • jules

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You must have wanted to do something like that?//module1.h #ifndef MODULE1_H #define MODULE1_H #include <string> class Hello1 { public: Hello1(); void SayMyHello(); void SayOtherHello() void fromMain(); private: string msg; } #endif //module1.cpp #include <iostream> #include "module1.h" #include "module2.h" Hello1::Hello1() { msg = "Hello from module #1"; } void Hello1::SayMyHello() { cout << msg << endl; } void Hello1::SayOtherHello() { Hello2 h2; h2.SayMyHello(); } void Hello1::fromMain() { cout << "This is a module #1" << endl; } //module2.h #ifndef MODULE2_H #define MODULE2_H #include <string> class Hello2 { public: Hello2(); void SayMyHello(); void SayOtherHello(); void fromMain(); private: string msg; } #endif //module2.cpp #include <iostream> #include "module1.h" #include "module2.h" Hello2::Hello2() { msg = "Hello from module #2"; } void Hello2::SayMyHello() { cout << msg << endl; } void Hello2::SayOtherHello() { Hello1 h1; h1.SayMyHello(); } void Hello2::fromMain() { cout << "This is a module #2" << endl; } //main.cpp #include <iostream> #include "module1.h" #include "module2.h" int main(int argc, char* argv[]) { Hello1 hl1; hl1.SayMyHello(); hl1.SayOtherHello(); hl1.fromMain(); Hello2 hl2 hl2.SayMyHello(); hl2.SayOtherHello(); hl2.fromMain(); return 0; }
Macro-s not working
Software Programming • c++ • • morde

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In order to work in the expected manner, we must write for example:fPRINT(One)(One); First One falls into macro, etc. fOnePrint♪ But to cause this function, the necessary parameters need to be transferred. In particular, add (One)♪ In fact, the compilers have keys to see the code after the preprocessor's work. This will allow you to see what macroes really turn into.
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Linked operations
Software Programming • c++ c language • • Oba22

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(1) Although you can add nodes at the beginning of a list, it will remain a simply linked list (LSE). Pq? By its own definition: "a list simply linked is the one in which each node has a pointer to the next node, except the last one, which is NULL".What you comment about operations at the beginning or end of non-circuit lists is used to help or facilitate certain operations. In fact, you could deploy more auxiliary nodes if you need it. Imagine you're implementing a dictionary of thousands of people (laws alphabetically ordained). If you want to insert a new node in the LSE it will be easier to consult the letter, for example, "S", and look for its correct position from that node instead of having to go through all the above.(2) In a simply linked circular list (LCSE) the same operations can be performed, as the only pointer that is usually referred to is the last one, so we can insert a new final node or even if we advance to the next of the last one, we would be in the first one, and we could insert at the beginning of the list (circular).If anything has not been clear, leave your question in the comments.
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How to remove elements from std:list<std::pair<>;</std::pair<>
Software Programming • c++ list stl funktor • • tahishae

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You don't have operators. == for A and Brespectively, not applicable pair<A,B>So the surgery. remove()which shall compare each element to the value indicated, it shall not be possible to do so.Use to remove a specific terator function element https://en.cppreference.com/w/cpp/container/list/erase ♪ There's no point in getting the terator, turning it into a meaning and retracing it. remove♪But it looks like you just want to remove all the elements in the cycle by completely clearing the list, don't you? If so, call. leres.clear() And don't torture. ♪ ♪UpdateThere's nothing new to change the question. In any case, a comparison of the elements in the list is required. Couple. Which is generally performed by comparing elements. You can just write your comparator to compare the elements (paras) and put it on the list when it is created.I'll give you a few decisionsclass A { }; class B { }; bool operator==(const A&,const A&) { return true; } bool operator==(const B&,const B&) { return true; } std::list<std::pair<A, B>> leres; int main() { leres.remove(*leres.begin()); } orclass A { }; class B { }; bool operator==(const pair<A,B>&,const pair<A,B>&) { return true; } std::list<std::pair<A, B>> leres; int main() { leres.remove(*leres.begin()); }
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How to implement std:lock to get him std:array<std::mutex> and blocked all the music?</std::mutex>
Software Programming • c++ multi point • • amarantha

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namespace details { template<typename T, size_t N, size_t ... Indexes> void lock_all_impl(std::array<T, N> & muts, std::index_sequence<Indexes...>) { std::lock(muts[Indexes]...); } }//end of namespace details template<typename T, size_t N> void lock_all(std::array<T, N> & muts) { details::lock_all_impl(muts, std::make_index_sequence<N>()); } //использование: std::array<std::mutex, mutex_count> arr; lock_all(arr);
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We need to speed up the algorithm. Lexikova &apos; s task
Software Programming • python python 3.x python 3.6 • • yajahira

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In [24]: from ast import literal_eval In [25]: from itertools import product In [26]: from functools import reduce In [27]: def validate(numbers, result): ...: if sum(numbers) >= result >= reduce(int.__sub__, sorted(numbers)): ...: return calculate(numbers, result) ...: return 'No solution' ...: ...: In [28]: def calculate(numbers, result): ...: pattern = '{}'.join(map(str, numbers)) ...: for i in product(['+', '-'], repeat=len(numbers)-1): ...: expr = pattern.format(*i) ...: if literal_eval(expr) == result: ...: return expr ...: return 'No solution' ...: ...: In [29]: validate([4, 3, 2, 1], -2) Out[29]: '4-3-2-1' In [30]: validate([4, 3, 2, 1], 10) Out[30]: '4+3+2+1' In [31]: validate([4, 3, 2, 1], 11) Out[31]: 'No solution' In [32]: validate([4, 3, 2, 1], -10) Out[32]: 'No solution'
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Transform double into RGB(Qcolor)
Software Programming • c++ qt • • magpie

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It's all in gray grading. Let's say we have numbers between 0 and 5, with two signs after the comma (0.15, etc.). 0, 5 is 255 Then it's simple:constexpr double minColorValue = 0, maxColorValue = 5.0; double X = getMyColorValue (); X = (X - minColorValue) / (maxColorValue - minColorValue) // ужимаем значения в диапазон 0÷1 QColor col = QColor::fromRGBF (X,X,X); SetPixel(x,y,col.rgb()); or that in this case the same is:QColor col = QColor::fromHSVF (0,0,X); orQColor col = QColor::fromHSLF (0,0,X); cf. documentation http://doc.qt.io/Qt-5/qcolor.html UpdatedIf I understand the original challenge correctly, for every picsel of the generosity picture, it's important and needs to be displayed in the gradient of the flowers, say the red. 0.0) and maximum1.0green. For intermediate colours, the gradient shall be used colour interpolation (sighs)interpolation) The most primitive option would be:QColor col1 = QColor::fromRGB (255, 0, 0); QColor col2 = QColor::fromRGB (0, 255, 0); double fac = getMyColorValue (); QColor target = QColor::fromRGB ( col1.red() * fac + col2.red() * (1-fac), col1.green()* fac + col2.green() * (1-fac), col1.blue() * fac + col2.blue() * (1-fac) ); SetPixel(x,y,col.rgb()); More pleasant/practical/interesting options can be interpolated in the hsv/hsl space, removed from floating arithmetics, added additional colours.
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Replace map of Google Maps
Software Programming • google maps • • guilherme

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I believe that using the google maps library with another image is not possible, but there are some similar tools that can help, such as http://openlayers.org/ which is free, and features quite advanced features. http://openlayers.org/en/v3.4.0/examples/ you find some examples of what can be done with it. http://openlayers.org/en/v3.4.0/doc/ seems to be quite complete, and it doesn't seem too difficult to implement.See this example used in http://openlayers.org/en/v3.4.0/doc/quickstart.html :<!doctype html> <html lang="en"> <head> <link rel="stylesheet" href="http://openlayers.org/en/v3.4.0/css/ol.css" type="text/css"> <style> .map { height: 400px; width: 100%; } </style> <script src="http://openlayers.org/en/v3.4.0/build/ol.js" type="text/javascript"></script> <title>OpenLayers 3 example</title> </head> <body> <h2>My Map</h2> <div id="map" class="map"></div> <script type="text/javascript"> var map = new ol.Map({ target: 'map', layers: [ new ol.layer.Tile({ source: new ol.source.MapQuest({layer: 'sat'}) }) ], view: new ol.View({ center: ol.proj.transform([37.41, 8.82], 'EPSG:4326', 'EPSG:3857'), zoom: 4 }) }); </script> </body> </html>
Map loading error with api google maps
Software Programming • javascript web application maps • • jeanid

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Google API Maps did not find the "initMap()" function, because it must have loaded before, due to the "async" attribute. Try to remove this attribute to see if it solves. If you do not resolve, set the function before the API call. See some important points also below: Set API loading at the end of <body> and ruin the call, for it is wrong ?key=??????=places&callback=initMap. The parameters are formed by key and value, for example: callback (key) and initMap (value). But the value "places", you did not define the key, which is "libraries". Just like this: ?key=??????&libraries=places&callback=initMap.Create your "initMap()" function before API loading, as in the example I did in the http://jsbin.com/rotonibire/edit?html,css,js,output .
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Using dynamic maps with Google Maps API
Software Programming • c sharp asp.net mvc google maps • • esther

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I don't understand how you'll use it. Googlemaps API with C#, it'll probably be a webView, I will not go into detail because the webView may be something Desktop or WindowsPhone (or other type of device), by the asp-net-mvc tag I suppose it is web, maybe after I edit it.If it's even web asp.net-mvc is just the "back-end" part, in case I go for an example then just javascript to use Google-Maps from the user's initial position, see an example in the documentation itself: https://developers.google.com/maps/documentation/javascript/examples/map-geolocation You will have to use navigator.geolocation.getCurrentPosition to get the user position.Notes:Change YOUR_API_KEY by your key (requires a google account)The browser requests a user permission to allow tracking<!DOCTYPE html> <html> <head> <title>Geolocation</title> <meta name="viewport" content="initial-scale=1.0, user-scalable=no"> <meta charset="utf-8"> <style> html, body { height: 100%; margin: 0; padding: 0; } #map { height: 100%; } </style> </head> <body> <div id="map"></div> <script> function initMap() { var map = new google.maps.Map(document.getElementById('map'), { center: {lat: -34.397, lng: 150.644}, zoom: 1 }); var infoWindow = new google.maps.InfoWindow({map: map}); // Try HTML5 geolocation. if (navigator.geolocation) { navigator.geolocation.getCurrentPosition(function(position) { var pos = { lat: position.coords.latitude, lng: position.coords.longitude }; infoWindow.setPosition(pos); infoWindow.setContent('Location found.'); map.setCenter(pos); }, function() { handleLocationError(true, infoWindow, map.getCenter()); }); } else { // Browser doesn't support Geolocation handleLocationError(false, infoWindow, map.getCenter()); } } function handleLocationError(browserHasGeolocation, infoWindow, pos) { infoWindow.setPosition(pos); infoWindow.setContent(browserHasGeolocation ? 'Error: The Geolocation service failed.' : 'Error: Your browser doesn't support geolocation.'); } </script> <script src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&signed_in=true&callback=initMap" async defer> </script> </body> </html>
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c++ Files connected
Software Programming • c++ header • • elysha

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That's the way it is:#if PATH == FIRST #define HDR "../catalog-1/SettingsResourcePack.hpp" #elif PATH == SECOND #define HDR "../catalog-2/SettingsResourcePack.hpp" #elif PATH == THIRD #define HDR "../catalog-3/SettingsResourcePack.hpp" #else #define HDR "../catalog-4/SettingsResourcePack.hpp" #endif #include HDR
removal of the element from the vector with its structure
Software Programming • c++ • • Analeea

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pica pica1; auto It = Picas.begin(); while (*It != &pica1 && It != Picas.end()) ++It; if(It != Picas.end()) //если найден Picas.erase(It); You tried to find through std:find. It's one of many options, too, and you'll already have a terator for this element, and you don't need it. Picas.begin(), especially as the terator of arbitrary access can add a calculated value, but no other terator... That's it.auto find_it = std::find(Picas.begin(), Picas.end(), &pica1); if(find_it != Picas.end()) //если найден Picas.erase(find_it);

Why do you need a container std: map? What's he going through with his map?

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