SimplifyC++ Article
When Can C++ Be Replaced A Question for Both Its Supporters and Its Critics
When Can C++ Be Replaced? A Question for Both Its Supporters and Its Critics
Disliking a Language Is Not an Engineering Plan, and Loving It Does Not Make It Perfect
C++ is widely criticized today for its complexity, accumulated features, difficulty of mastery, memory-related risks caused by incorrect use, and the uneven quality of code written in it.
Some of this criticism is valid and should not be denied.
However, there is an enormous difference between saying:
C++ has real problems that must be addressed.
and saying:
Let us eliminate it and rewrite major software systems in another language.
The first statement is legitimate technical criticism. The second is not a simple decision, because it immediately raises a much harder question:
Which language should replace it, how long would the migration take, and who can guarantee that the new version will preserve the same performance, compatibility, and stability?
What Exactly Are We Talking About Replacing?
We are not talking about a few small applications that could be rewritten within several months. We are talking about large parts of the modern digital world.
In web browsers, we find Chromium, Google Chrome, and Microsoft Edge, as well as major parts of Firefox and the Gecko engine.
In desktop applications and multimedia software, we find Blender, the Cycles rendering engine, OBS Studio, Telegram Desktop, 7-Zip, LibreOffice, Inkscape, Krita, Audacity, KDE Plasma, and many KDE applications.
These projects rely on C++ or use it in major performance-critical components, even when they also use other languages.
In game engines and graphics, we find Unreal Engine and Godot.
In virtualization, we find VirtualBox and important parts of VMware products.
In software infrastructure, we find Qt and the Boost libraries.
Among compilers and development tools, we find LLVM and Clang.
In computer vision, scientific computing, robotics, and engineering, we find OpenCV, OpenFOAM, ROS, and ROS 2.
In databases and infrastructure, we find MySQL, MongoDB, and Bitcoin Core.
Even platforms that most users access through Python, such as PyTorch and TensorFlow, rely on C++ in their core engines or major execution components. PyTorch, for example, can be built and used through libtorch without Python.
Important parts and tools within Windows, along with products from Microsoft and Adobe, also rely on C++ or provide native interfaces and extensions through it. Because many of these products are closed source, it is impossible to determine the exact percentage of C++ code from the outside.
The real question, therefore, is not:
Can we write an alternative program in another language?
It is:
Can we migrate these enormous systems while preserving their behavior, performance, compatibility, users, and extension ecosystems, even as they continue evolving every day?
At that point, the answer changes completely.
Source Code Is Not Just a Collection of Lines That Can Be Translated
Someone may look at a project containing millions of lines of code and say: rewrite those lines in a safer language and the problem is solved.
But the real value of software does not lie in its lines alone.
Old code contains knowledge accumulated over many years:
Solutions to rare hardware problems.
Handling for edge cases that appear only among millions of users.
Compatibility with different operating systems, processors, and drivers.
Performance optimizations produced after thousands of measurements.
Behavior relied upon by third-party applications and extensions.
Fixes for old bugs whose original causes may no longer be remembered.
Testing, build, debugging, and deployment infrastructure refined over time.
When you rewrite a project, you are not merely translating source code. You are attempting to rediscover and reproduce all of that knowledge.
You may succeed in creating a cleaner, shorter, and safer implementation, but it does not immediately become equivalent to software tested across billions of real-world situations.
A Complete Rewrite May Replace Known Bugs with Unknown Ones
An old program may contain flaws, but most of its known flaws have already been tested, corrected, monitored, or at least understood.
A new implementation begins an entirely new history of defects.
A new language may eliminate an entire category of memory errors, which is a major advantage, but it does not automatically prevent:
Logic errors.
High-level concurrency bugs.
Protocol misunderstandings.
Performance problems.
Behavioral differences from the original implementation.
Loss of file-format or extension compatibility.
Interface and driver integration bugs.
Poor management of resources unrelated to memory.
A rewrite is therefore not a transition from “defective software” to “correct software.” It is a transition from a system with known risks to a new system with different and largely unknown risks.
Why Is There No Single Replacement Language Yet?
Some may argue that Rust is the obvious successor.
There is no doubt that Rust offers a powerful model for memory safety and concurrency, and it is an excellent candidate for many new components.
But can it currently replace C++ by itself across browsers, game engines, graphical interfaces, compilers, databases, robotics, artificial intelligence, design software, embedded systems, legacy software, and every processor and platform?
Not yet, and not in the comprehensive sense required.
Chromium itself does not treat Rust as a button that erases C++. Instead, it develops clear interoperability tools and interfaces that allow Rust components to operate inside an existing C++ ecosystem.
That is the realistic model: gradual integration, not total demolition.
Ada and SPARK are powerful and mature in safety-critical systems, reliability, and formal verification. However, they do not have the same level of adoption across game engines, multimedia, graphical frameworks, artificial intelligence, and general-purpose libraries.
C provides direct control and close access to hardware, but it does not provide the same abstractions as C++, and it may require much more manual work when building very large systems.
Java, C#, and Go are excellent in many fields, but their runtime models, garbage collection, and native-code integration make them unsuitable as universal replacements for every low-level or latency-sensitive project.
The problem is not that the world is incapable of creating a language that is better than C++ in one particular area.
The problem is that the phrase “better than C++” does not refer to a single property.
Better in what way?
Memory safety?
Raw performance?
Predictable latency?
Operation without a runtime environment?
Support for unusual processors?
Binary compatibility?
Library availability?
Debugging tools?
Embedded systems?
GPU computing?
Developer availability?
Stability over several decades?
A language may outperform C++ in several of these areas, but that does not mean it automatically surpasses the entire C++ ecosystem.
A Language Does Not Mature Through Its Specification Alone
Suppose a new language appeared tomorrow. It was safer, simpler, and capable of matching C++ performance.
Could everything immediately be migrated to it?
No.
That language would still need many years to build:
Stable and fast compilers.
Debuggers and performance profilers.
Linkers and build systems.
Support for operating systems and processor architectures.
Graphics, networking, and scientific libraries.
Integration with CUDA and other GPU interfaces.
Static-analysis and verification tools.
A reliable package manager.
Compatibility with legacy libraries.
Stable binary-interface conventions.
Experienced developers.
Companies willing to accept the risks of adopting it.
A long history of operation in real production systems.
C++ derives its strength not only from the language design itself, but from decades of compilers, libraries, standards, tools, developers, and accumulated experience.
For a new language to become a true replacement, it is not enough for it to look cleaner in educational examples. It must survive the same pressures C++ has faced for decades.
When Could These Systems Actually Be Migrated?
There is no single answer.
A small tool or isolated component may be rewritten within months.
A sensitive subsystem may require several years of parallel development and testing.
A project the size of a browser, game engine, database, or artificial-intelligence framework may require a decade or more—and the rewrite may never truly finish because the original project continues to evolve during the migration.
This creates a difficult paradox:
While one team is rewriting today’s version, the original team is adding tomorrow’s features, platforms, performance improvements, and bug fixes.
The rewrite becomes a pursuit of a moving target.
The realistic scenario is therefore not that one morning Chromium, Unreal Engine, or LLVM suddenly appears fully rewritten in another language.
The more likely path is:
Write new components in the most suitable language.
Isolate dangerous areas behind clear interfaces.
Gradually migrate selected libraries.
Retain stable and high-performance components in C++.
Improve existing code with static analysis, testing, and stronger isolation.
Allow several languages to coexist within the same product.
Over many years, the amount of C++ in some projects may decrease, and it may disappear from particular subsystems.
That is very different from replacing it all at once.
Does This Mean C++ Will Live Forever?
No.
No programming language is eternal, and C++ should never be treated as a doctrine.
A time may come when another language offers the same performance, control, adoption, compatibility, and ecosystem maturity, while providing greater safety and lower complexity.
But even after such a language appears, major systems will not migrate to it immediately.
The transition will begin with new projects, then isolated components, then larger subsystems, followed by years of mixed-language operation. Only after that could we reasonably speak of a broad replacement.
The appearance of an alternative is one thing.
Its maturity is another.
Migrating the world’s existing software heritage to it is a third and far more difficult challenge.
A Message to Those Who Dislike C++
You have every right to criticize C++, refuse to use it in a new project, and choose Rust, Ada, Go, C#, or any other tool that better suits your needs.
But do not confuse disliking a language with being able to remove the infrastructure built upon it.
Software is not migrated through slogans.
Millions of lines of code do not disappear because the syntax is difficult.
Systems serving the world are not rewritten merely because another language appears cleaner.
Build a working replacement.
Prove that it is faster, safer, or easier to maintain.
Preserve compatibility.
Operate it for years under real workloads.
Then the discussion becomes engineering rather than rhetoric.
A Message to Those Who Love C++
The existence of these great systems does not mean C++ is perfect, nor does it justify denying its problems.
The historical strength of the language does not excuse its community from improving safety, simplifying tools, modernizing libraries, encouraging better programming practices, using static analysis, strengthening testing, isolating risky components, and learning from other languages.
An honest defense of C++ does not consist of denying its flaws.
It consists of proving that the language and its ecosystem can evolve and address the reasons behind the criticism.
Conclusion: Replacement Is Theoretically Possible, but Practically Unrealistic Today
No law of nature prevents Blender, Chromium, MySQL, LLVM, or Unreal Engine from being rewritten in another language.
Therefore, replacement is not theoretically impossible.
However, replacing C++ across all these systems with one language that is better while preserving performance, compatibility, maturity, and stability is not practically realistic today.
It may not even be necessary.
The most likely future is not the victory of one language and the extinction of all others. It is a multilingual world in which C++ remains where it is strong and proven, Rust is introduced where memory safety is a priority, Ada continues in safety-critical systems, Python remains important for productivity and research, and other languages are used wherever they offer clear advantages.
C++ is not beyond criticism, but it is also not a removable component that can be pulled out of modern computing without an enormous cost.
Anyone who believes the replacement is already ready should not merely offer slogans about the death of C++. They should present an ecosystem capable of carrying the burdens this language has carried for decades.
Only then will the question stop being:
Why do we not abandon C++?
and become:
Why should we continue using it when the alternative has truly become more mature and more capable?
Until that moment arrives, improving C++, using it more safely, and gradually introducing other languages where they are genuinely better will remain far wiser and more realistic than attempting to demolish an entire software world and rebuild it from scratch.