Update main_statements.md

Author: flexferrum

docs/usage/main_statements.md

@@ -1,5 +1,5 @@
 ---
-layout: default
+layout: prev_next_page
 title: "Main statements"
 parent: Jinja2C++ Usage
 nav_order: 2
@@ -65,65 +65,3 @@ This template uses two significant jinja2 template features:
 std::string prefix = !descr.nsScope.empty() ? descr.nsScope + "::" : "";
 ```
 I.e. left part of this expression (before 'if') is a true-branch of the statement. Right part (after 'else') - false-branch, which can be omitted. As a condition you can use any expression convertible to bool.
-
-{% assign children_list = site.html_pages | sort:"nav_order" %}
-{% for child in children_list %}
-  {% unless forloop.first or current.parent != page.parent %}
-    {% if cur_page == nil %}
-        {% assign prev_page = current %}
-    {% endif %}
-  {% endunless %}
-  {% unless cur_page == nil %}
-    {% if next_page == nil %}
-        {% assign next_page = child %}
-    {% endif %}
-  {% endunless %}
-  {% assign current = child %}
-  {% if child.title == page.parent %}
-    {% assign parent_page = child %}
-    parent.nav_order (1) = {{ parent_page.nav_order }}<br/>
-    parent.url (1) = {{ parent_page.url }}<br/>
-    parent.title (1) = {{ parent_page.title }}<br/>
-  {% endif %}
-  {% if child.parent == page.parent and  child.title == page.title %}
-    {% assign cur_page = child %}
-    child.nav_order = {{ child.nav_order }}<br/>
-    child.url = {{ child.url }}<br/>
-    parent.nav_order = {{ parent_page_info.nav_order }}<br/>
-    parent.url = {{ parent_page_info.url }}<br/>
-    parent.title = {{ parent_page_info.title }}<br/>
-    forloop.index = {{ forloop.index }}<br/>
-    url[current] = {{ children_list[forloop.index0].url }}<br/>
-    title[current] = {{ children_list[forloop.index0].title }}<br/>
-    <a href="{{ child.url | absolute_url }}">{{ child.title }}</a>
-  {% endif %}
-{% endfor %}
-parent.parent = {{ parent_page.parent }}<br/>
-parent.nav_order = {{ parent_page.nav_order }}<br/>
-parent.url = {{ parent_page.url }}<br/>
-parent.title = {{ parent_page.title }}<br/><br/>
-prev.parent = {{ prev_page.parent }}<br/>
-prev.nav_order = {{ prev_page.nav_order }}<br/>
-prev.url = {{ prev_page.url }}<br/>
-prev.title = {{ prev_page.title }}<br/><br/>
-cur.parent = {{ cur_page.parent }}<br/>
-cur.nav_order = {{ cur_page.nav_order }}<br/>
-cur.url = {{ cur_page.url }}<br/>
-cur.title = {{ cur_page.title }}<br/><br/>
-next.parent = {{ next_page.parent }}<br/>
-next.nav_order = {{ next_page.nav_order }}<br/>
-next.url = {{ next_page.url }}<br/>
-next.title = {{ next_page.title }}<br/><br/>
-<p><div align="center">
-{% if prev_page != nil and prev_page.parent == page.parent %}
-    <a href="{{ prev_page.url | absolute_url }}">&lt; Prev</a>
-{% else %}
-    &lt; Prev
-{% endif %} | <a href="{{ parent_page.url | absolute_url }}">Up</a> | 
-{% if next_page != nil and next_page.parent == page.parent %}
-    <a href="{{ next_page.url | absolute_url }}">Next &gt;</a>
-{% else %}
-    Next &gt;
-{% endif %}
-</div></p>
-