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ObserverManager

Generalized observer pattern based on C++11 variadic templates.

This implementation of the Observer pattern allows you to group events in interfaces (further called protocols) with the ability to parametrize them as you like. A single observer can be subscribed to different groups of events simultaneously. All observers are automatically unsubscribed when their destructor is called, so no memory issues will arise. Observers are passed to manager as pointers, shared pointers are supported as well.

Here's a sample use:

#include<iostream>
#include"ObserverManager.h"classMoneyProtocol : publicBaseObserverProtocol {
public:virtualvoidadd(unsignedint sum) {}
virtualvoidwithdraw(unsignedint sum, const std::string& item) {}
};
classWorker : publicMoneyProtocol {
public:virtualvoidadd(constunsignedint sum) override {
std::cout << "Look, dear, I've earned " << std::to_string(sum) << "$ today!" << std::endl;
}
virtualvoidwithdraw(unsignedint sum, const std::string& item) override {
std::cout << "Oh, I've spent " << std::to_string(sum) << "$ on " << item << " today..." << std::endl;
}
};
intmain() {
Worker* jim = newWorker();
ObserverManager::subscribe<MoneyProtocol>(jim);
ObserverManager::notify(&MoneyProtocol::add, 500);
ObserverManager::notify(&MoneyProtocol::withdraw, 100, "SuperBurger");
ObserverManager::unsubscribe(jim);
delete jim;
}

To clone and run tests:

git clone --recursive https://github.com/fnz/ObserverManager.git
cd ObserverManager
./run_tests.sh

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, 'i'); if (__m === '*' || __re.test(location.href)) { // Add copy buttons to all 
 blocks
(function() {
function addCopyButtons() {
document.querySelectorAll('pre code').forEach(function(codeBlock) {
if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;
codeBlock.parentElement.setAttribute('data-copy-added', 'true');
var btn = document.createElement('button');
btn.textContent = 'Copy';
btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';
btn.onmouseover = function() { this.style.opacity = '1'; };
btn.onmouseout = function() { this.style.opacity = '0.7'; };
btn.onclick = function() {
navigator.clipboard.writeText(codeBlock.textContent).then(function() {
btn.textContent = 'Copied!';
setTimeout(function() { btn.textContent = 'Copy'; }, 1500);
});
};
codeBlock.parentElement.style.position = 'relative';
codeBlock.parentElement.appendChild(btn);
});
}
addCopyButtons();
// Re-run on dynamic content
var observer = new MutationObserver(addCopyButtons);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '
GitHub - fnz/ObserverManager: Observer pattern for C++11 based on variadic templates · GitHub
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ObserverManager
Generalized observer pattern based on C++11 variadic templates.
This implementation of the Observer pattern allows you to group events in interfaces (further called protocols) with the ability to parametrize them as you like. A single observer can be subscribed to different groups of events simultaneously. All observers are automatically unsubscribed when their destructor is called, so no memory issues will arise. Observers are passed to manager as pointers, shared pointers are supported as well.
Here's a sample use:
#include<iostream>
#include"ObserverManager.h"classMoneyProtocol : publicBaseObserverProtocol {
public:virtualvoidadd(unsignedint sum) {}
virtualvoidwithdraw(unsignedint sum, const std::string& item) {}
};
classWorker : publicMoneyProtocol {
public:virtualvoidadd(constunsignedint sum) override {
std::cout << "Look, dear, I've earned " << std::to_string(sum) << "$ today!" << std::endl;
}
virtualvoidwithdraw(unsignedint sum, const std::string& item) override {
std::cout << "Oh, I've spent " << std::to_string(sum) << "$ on " << item << " today..." << std::endl;
}
};
intmain() {
Worker* jim = newWorker();
ObserverManager::subscribe<MoneyProtocol>(jim);
ObserverManager::notify(&MoneyProtocol::add, 500);
ObserverManager::notify(&MoneyProtocol::withdraw, 100, "SuperBurger");
ObserverManager::unsubscribe(jim);
delete jim;
}
To clone and run tests:
git clone --recursive https://github.com/fnz/ObserverManager.git
cd ObserverManager
./run_tests.sh

About
Observer pattern for C++11 based on variadic templates
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Force GitHub README to respect dark mode
(function() {
var style = document.createElement('style');
style.textContent = '
.markdown-body {
color-scheme: dark light;
}
.markdown-body pre { background: #161b22 !important; }
.markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }
.markdown-body table th, .markdown-body table td { border-color: #30363d !important; }
.markdown-body img { background: #0d1117; }
.markdown-body blockquote { border-left-color: #8b949e; }
.markdown-body hr { border-color: #30363d; }
';
document.head.appendChild(style);
})();
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
GitHub - fnz/ObserverManager: Observer pattern for C++11 based on variadic templates · GitHub
Skip to content
BranchesTags
Repository files navigation
ObserverManager
Generalized observer pattern based on C++11 variadic templates.
This implementation of the Observer pattern allows you to group events in interfaces (further called protocols) with the ability to parametrize them as you like. A single observer can be subscribed to different groups of events simultaneously. All observers are automatically unsubscribed when their destructor is called, so no memory issues will arise. Observers are passed to manager as pointers, shared pointers are supported as well.
Here's a sample use:
#include<iostream>
#include"ObserverManager.h"classMoneyProtocol : publicBaseObserverProtocol {
public:virtualvoidadd(unsignedint sum) {}
virtualvoidwithdraw(unsignedint sum, const std::string& item) {}
};
classWorker : publicMoneyProtocol {
public:virtualvoidadd(constunsignedint sum) override {
std::cout << "Look, dear, I've earned " << std::to_string(sum) << "$ today!" << std::endl;
}
virtualvoidwithdraw(unsignedint sum, const std::string& item) override {
std::cout << "Oh, I've spent " << std::to_string(sum) << "$ on " << item << " today..." << std::endl;
}
};
intmain() {
Worker* jim = newWorker();
ObserverManager::subscribe<MoneyProtocol>(jim);
ObserverManager::notify(&MoneyProtocol::add, 500);
ObserverManager::notify(&MoneyProtocol::withdraw, 100, "SuperBurger");
ObserverManager::unsubscribe(jim);
delete jim;
}
To clone and run tests:
git clone --recursive https://github.com/fnz/ObserverManager.git
cd ObserverManager
./run_tests.sh

About
Observer pattern for C++11 based on variadic templates
Resources
Readme
Activity
Stars
31 stars
Watchers
3 watching
Forks
10 forks
Report repository
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Highlight search terms from Google/DuckDuckGo/Bing referrer
(function() {
var ref = document.referrer;
var terms = [];
if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {
var url = new URL(ref);
var q = url.searchParams.get('q') || url.searchParams.get('p');
if (q) {
terms = q.split(/\s+/).filter(function(t) { return t.length > 2; });
}
}
if (terms.length === 0) return;
var style = document.createElement('style');
style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';
document.head.appendChild(style);
function highlight(node) {
if (node.nodeType === 3) { // text node
var text = node.textContent;
var found = false;
terms.forEach(function(term) {
var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\]\\]/g, '\\') + ')', 'gi');
if (regex.test(text)) {
found = true;
var frag = document.createDocumentFragment();
var parts = text.split(regex);
parts.forEach(function(part, i) {
if (i % 2 === 0) {
frag.appendChild(document.createTextNode(part));
} else {
var span = document.createElement('span');
span.className = 'userscript-highlight';
span.textContent = part;
frag.appendChild(span);
}
});
node.parentNode.replaceChild(frag, node);
}
});
} else if (node.nodeType === 1 && node.childNodes) { // element
var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];
if (!skipTags.includes(node.tagName)) {
Array.from(node.childNodes).forEach(highlight);
}
}
}
highlight(document.body);
// Re-highlight on dynamic content
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1 || node.nodeType === 3) highlight(node);
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
GitHub - fnz/ObserverManager: Observer pattern for C++11 based on variadic templates · GitHub
Skip to content
BranchesTags
Repository files navigation
ObserverManager
Generalized observer pattern based on C++11 variadic templates.
This implementation of the Observer pattern allows you to group events in interfaces (further called protocols) with the ability to parametrize them as you like. A single observer can be subscribed to different groups of events simultaneously. All observers are automatically unsubscribed when their destructor is called, so no memory issues will arise. Observers are passed to manager as pointers, shared pointers are supported as well.
Here's a sample use:
#include<iostream>
#include"ObserverManager.h"classMoneyProtocol : publicBaseObserverProtocol {
public:virtualvoidadd(unsignedint sum) {}
virtualvoidwithdraw(unsignedint sum, const std::string& item) {}
};
classWorker : publicMoneyProtocol {
public:virtualvoidadd(constunsignedint sum) override {
std::cout << "Look, dear, I've earned " << std::to_string(sum) << "$ today!" << std::endl;
}
virtualvoidwithdraw(unsignedint sum, const std::string& item) override {
std::cout << "Oh, I've spent " << std::to_string(sum) << "$ on " << item << " today..." << std::endl;
}
};
intmain() {
Worker* jim = newWorker();
ObserverManager::subscribe<MoneyProtocol>(jim);
ObserverManager::notify(&MoneyProtocol::add, 500);
ObserverManager::notify(&MoneyProtocol::withdraw, 100, "SuperBurger");
ObserverManager::unsubscribe(jim);
delete jim;
}
To clone and run tests:
git clone --recursive https://github.com/fnz/ObserverManager.git
cd ObserverManager
./run_tests.sh

About
Observer pattern for C++11 based on variadic templates
Resources
Readme
Activity
Stars
31 stars
Watchers
3 watching
Forks
10 forks
Report repository
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Strip utm_, fbclid, gclid, etc. from all links on page
(function() {
var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',
'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',
'ref', 'ref_src', 'source', 'medium', 'campaign'];
function cleanUrl(url) {
try {
var u = new URL(url, window.location.origin);
var changed = false;
trackingParams.forEach(function(p) {
if (u.searchParams.has(p)) {
u.searchParams.delete(p);
changed = true;
}
});
return changed ? u.toString() : url;
} catch (e) {
return url;
}
}
function cleanLinks() {
document.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
cleanLinks();
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1) {
if (node.tagName === 'A') cleanLinks();
node.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '
GitHub - fnz/ObserverManager: Observer pattern for C++11 based on variadic templates · GitHub
Skip to content
BranchesTags
Repository files navigation
ObserverManager
Generalized observer pattern based on C++11 variadic templates.
This implementation of the Observer pattern allows you to group events in interfaces (further called protocols) with the ability to parametrize them as you like. A single observer can be subscribed to different groups of events simultaneously. All observers are automatically unsubscribed when their destructor is called, so no memory issues will arise. Observers are passed to manager as pointers, shared pointers are supported as well.
Here's a sample use:
#include<iostream>
#include"ObserverManager.h"classMoneyProtocol : publicBaseObserverProtocol {
public:virtualvoidadd(unsignedint sum) {}
virtualvoidwithdraw(unsignedint sum, const std::string& item) {}
};
classWorker : publicMoneyProtocol {
public:virtualvoidadd(constunsignedint sum) override {
std::cout << "Look, dear, I've earned " << std::to_string(sum) << "$ today!" << std::endl;
}
virtualvoidwithdraw(unsignedint sum, const std::string& item) override {
std::cout << "Oh, I've spent " << std::to_string(sum) << "$ on " << item << " today..." << std::endl;
}
};
intmain() {
Worker* jim = newWorker();
ObserverManager::subscribe<MoneyProtocol>(jim);
ObserverManager::notify(&MoneyProtocol::add, 500);
ObserverManager::notify(&MoneyProtocol::withdraw, 100, "SuperBurger");
ObserverManager::unsubscribe(jim);
delete jim;
}
To clone and run tests:
git clone --recursive https://github.com/fnz/ObserverManager.git
cd ObserverManager
./run_tests.sh

About
Observer pattern for C++11 based on variadic templates
Resources
Readme
Activity
Stars
31 stars
Watchers
3 watching
Forks
10 forks
Report repository
Releases
Packages
Contributors
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Auto-enable theater mode on YouTube
(function() {
function tryTheater() {
var btn = document.querySelector('button[aria-label="Theater mode"], ytd-player #player button[title="Theater mode"]');
if (btn && !btn.classList.contains('activated')) {
btn.click();
}
}
// Try immediately
tryTheater();
// Try after navigation (SPA)
var lastUrl = location.href;
setInterval(function() {
if (location.href !== lastUrl) {
lastUrl = location.href;
setTimeout(tryTheater, 500);
}
}, 1000);
// Also try on player load
var observer = new MutationObserver(tryTheater);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
GitHub - fnz/ObserverManager: Observer pattern for C++11 based on variadic templates · GitHub
Skip to content
BranchesTags
Repository files navigation
ObserverManager
Generalized observer pattern based on C++11 variadic templates.
This implementation of the Observer pattern allows you to group events in interfaces (further called protocols) with the ability to parametrize them as you like. A single observer can be subscribed to different groups of events simultaneously. All observers are automatically unsubscribed when their destructor is called, so no memory issues will arise. Observers are passed to manager as pointers, shared pointers are supported as well.
Here's a sample use:
#include<iostream>
#include"ObserverManager.h"classMoneyProtocol : publicBaseObserverProtocol {
public:virtualvoidadd(unsignedint sum) {}
virtualvoidwithdraw(unsignedint sum, const std::string& item) {}
};
classWorker : publicMoneyProtocol {
public:virtualvoidadd(constunsignedint sum) override {
std::cout << "Look, dear, I've earned " << std::to_string(sum) << "$ today!" << std::endl;
}
virtualvoidwithdraw(unsignedint sum, const std::string& item) override {
std::cout << "Oh, I've spent " << std::to_string(sum) << "$ on " << item << " today..." << std::endl;
}
};
intmain() {
Worker* jim = newWorker();
ObserverManager::subscribe<MoneyProtocol>(jim);
ObserverManager::notify(&MoneyProtocol::add, 500);
ObserverManager::notify(&MoneyProtocol::withdraw, 100, "SuperBurger");
ObserverManager::unsubscribe(jim);
delete jim;
}
To clone and run tests:
git clone --recursive https://github.com/fnz/ObserverManager.git
cd ObserverManager
./run_tests.sh

About
Observer pattern for C++11 based on variadic templates
Resources
Readme
Activity
Stars
31 stars
Watchers
3 watching
Forks
10 forks
Report repository
Releases
Packages
Contributors
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Remove or un-stick sticky/fixed headers that block content
(function() {
function unstick() {
document.querySelectorAll('header, nav, [role="banner"], .header, .navbar, .sticky, .fixed-top, [style*="position: fixed"], [style*="position:sticky"]').forEach(function(el) {
if (el.style.position === 'fixed' || el.style.position === 'sticky' || getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {
el.style.position = 'static';
el.style.top = 'auto';
el.style.zIndex = 'auto';
}
});
}
unstick();
var observer = new MutationObserver(unstick);
observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });
})();
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
})();
GitHub - fnz/ObserverManager: Observer pattern for C++11 based on variadic templates · GitHub
Skip to content
BranchesTags
Repository files navigation
ObserverManager
Generalized observer pattern based on C++11 variadic templates.
This implementation of the Observer pattern allows you to group events in interfaces (further called protocols) with the ability to parametrize them as you like. A single observer can be subscribed to different groups of events simultaneously. All observers are automatically unsubscribed when their destructor is called, so no memory issues will arise. Observers are passed to manager as pointers, shared pointers are supported as well.
Here's a sample use:
#include<iostream>
#include"ObserverManager.h"classMoneyProtocol : publicBaseObserverProtocol {
public:virtualvoidadd(unsignedint sum) {}
virtualvoidwithdraw(unsignedint sum, const std::string& item) {}
};
classWorker : publicMoneyProtocol {
public:virtualvoidadd(constunsignedint sum) override {
std::cout << "Look, dear, I've earned " << std::to_string(sum) << "$ today!" << std::endl;
}
virtualvoidwithdraw(unsignedint sum, const std::string& item) override {
std::cout << "Oh, I've spent " << std::to_string(sum) << "$ on " << item << " today..." << std::endl;
}
};
intmain() {
Worker* jim = newWorker();
ObserverManager::subscribe<MoneyProtocol>(jim);
ObserverManager::notify(&MoneyProtocol::add, 500);
ObserverManager::notify(&MoneyProtocol::withdraw, 100, "SuperBurger");
ObserverManager::unsubscribe(jim);
delete jim;
}
To clone and run tests:
git clone --recursive https://github.com/fnz/ObserverManager.git
cd ObserverManager
./run_tests.sh

About
Observer pattern for C++11 based on variadic templates
Resources
Readme
Activity
Stars
31 stars
Watchers
3 watching
Forks
10 forks
Report repository
Releases
Packages
Contributors
Languages