index.html

---
layout: default
description: A repository of modern and idiomatic C++ code patterns curated by the community.
---

      <section class="sample featured">
        <div class="row">
          <h1 class="column-4">Featured pattern: <a href="{{ site.baseurl }}/patterns/{{ page.random_sample.name }}.html">{{ page.random_sample.primary.title }}</a></h1>
        </div>
        <div class="row">
          <div class="column-2">
            <a href="{{ site.baseurl }}/patterns/{{ page.random_sample.name }}.html">
              {% codeblock cpp %}{{ page.random_sample.primary.code }}{% endcodeblock %}
            </a>
            <div class="code-overlay">
              <a href="{{ site.baseurl }}/patterns/{{ page.random_sample.name }}.html" class="code-overlay">
                Continue reading →
              </a>
            </div>
          </div>
          <div class="column-2">
{% assign min_spec = page.random_sample.min_spec %}
            <div class="min-spec">
              Requires
              <span class="tag {{ min_spec }}"><a href="/#/search/tag:{{ min_spec }}">{{ min_spec }}</a></span>
              {% if min_spec != 'experimental' %}or newer{% endif %}
            </div>
            <h2>Intent</h2>
            {{ page.random_sample.primary | sample_intent }}
            <h2>Description</h2>
            {{ page.random_sample.primary | sample_description | truncatewords: 35 }}
            <p><a href="{{ site.baseurl }}/patterns/{{ page.random_sample.name }}.html">Continue reading →</a></p>
          </div>
        </div>
      </section>
{% if site.environment == 'production' %}
      <div class="row">
        <div class="column-4">
          <ins class="adsbygoogle" style="display:block" data-ad-client="ca-pub-6789411983750873" data-ad-slot="4105099934" data-ad-format="auto"></ins>
        </div>
      </div>
{% endif %}
      <section class="samples-index">
        <div class="row">
          <h1 class="column-4">All patterns</h1>
        </div>
{% for category in page.sample_categories %}
  {% assign groupname = forloop.index %}
        <section class="samples-section">
          <div class="samples-section-header row">
            <h1 class="column-4">{{ category[0].title }}</h1>
          </div>
          <div class="row">
  {% for sample in category[1] %}
            <div class="index-item column-1">
              <h1><a href="{{ site.baseurl }}/patterns/{{ sample.name }}.html">{{ sample.primary.title }}</a></h1>
    {% assign min_spec = sample.min_spec %}
              <div class="min-spec">
                Requires
                <span class="tag {{ min_spec }}"><a href="/#/search/tag:{{ min_spec }}">{{ min_spec }}</a></span>
                {% if min_spec != 'experimental' %}or newer{% endif %}
              </div>
              {{ sample.primary | sample_intent }}
            </div>
          {% cycle groupname: '', '', '', '</div><div class="row">' %}
  {% endfor %}
          </div>
        </section>
{% endfor %}
      </section>
      <section class="search-results">
        <div class="row">
          <div class="column-4">
            <a href="{{ site.baseurl }}/">← All patterns</a>
            <h1>Search Results</h1>
          </div>
        </div>
        <section id="results" class="samples-section"></div>
      </section>
      <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.4/jquery.min.js"></script>
      <script>
var specs = ['{{ page.specs | join: "', '" }}']

function filterSamples(event) {
  var query = $('#search').val();

  if (query.length > 0) {
    $('.featured').fadeOut(200);
    $('.samples-index').fadeOut(200, function() {
      $('.search-results').fadeIn(200);
    });

    $("#results").empty();

    var tags = []

    var words = query.split(/[ ,]+/).reduce(function(words, word) {
      if (word.startsWith('tag:')) {
        tags.push(word.slice(4))
      } else {
        words.push(word.toLowerCase())
      }
      return words
    }, []);

    var matchingItems = $('.index-item').filter(function() {
      var content = ($(this).children('h1').text() + ' ' + $(this).children('p').text()).toLowerCase();
      var tagContent = $(this).find('.tag').text();

      var wordsMatch = words.every(function(word) {
        return content.indexOf(word) != -1;
      })

      var tagsMatch = tags.every(function(tag) {
        return specs.indexOf(tag) >= specs.indexOf(tagContent);
      })

      return wordsMatch && tagsMatch;
    }).clone();

    var rows = [];

    if (matchingItems.length > 0) {
      matchingItems.each(function(index) {
        if (index % 4 == 0) {
          rows.push($('<div class="row"></div>'));
        }

        rows[rows.length - 1].append($(this));
      });
    } else {
      rows.push($('<div class="row"><div class="column-4"><p>No patterns found matching your query.</p></div></div>'));
    }

    $("#results").append(rows);

    history.replaceState({query: query}, '', '/#/search/' + encodeURIComponent(query));
  } else {
    $('.search-results').fadeOut(200, function() {
      $('.featured').fadeIn(200);
      $('.samples-index').fadeIn(200);
    });

    history.replaceState({}, '', '/');
  }
}

function clearSearch() {
  $('#search').val('');
  filterSamples();
}

function onHashChange() {
  var match = window.location.hash.match(/^#\/search\/(.*)$/);
  $('#search').val(match[1]);
  filterSamples();
}

$(function() {
  $('#search')
    .on('input', filterSamples)
    .keyup(function(event) {
      if (event.keyCode == 27) {
        clearSearch();
      }
    });

  var currentState = history.state;
  if (currentState && currentState.query) {
    $('#search').val(currentState.query);
    filterSamples();
  } else if (window.location.hash) {
    onHashChange();
  }

  $(window).on('hashchange', onHashChange);
});
      </script>