Carbon (programming language): Difference between revisions

Revision as of 10:18, 23 February 2024

Latest revision as of 02:20, 9 August 2025

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| designer = [[Google]]

| typing = [[Static type|Static]], [[Nominal type system|nominative]], [[Type inference|partly inferred]]

| influenced by = [[C++]], [[Rust (programming language)|Rust]], [[SwiftZig (programming language)|SwiftZig]], [[Haskell {{citation(programming neededlanguage)|dateHaskell]], [[Kotlin (programming language)|Kotlin]], [[Swift (programming language)|Swift]]<ref name=August"cppnorthkeynote-video" 2023}}/>

| programming language = [[C++]]

| license = [[Apache-2.0-with-LLVM-Exception]]

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}}

'''Carbon''' is an experimental [[programming language]] designed for interoperability with [[C++]].<ref name="readme">{{cite web|title=README|url=https://github.com/carbon-language/carbon-lang/blob/trunk/README.md|quote="It is designed around interoperability with C++ as well as large-scale adoption and migration for existing C++ codebases and developers."|accessdate=2023-09-06}}</ref> The project is [[Open-source software|open-source]] and was started at [[Google]]. Google engineer Chandler Carruth first introduced Carbon at the CppNorth conference in [[Toronto]] in July 2022. He stated that Carbon was created to be a C++ successor.<ref name="cppnorthkeynote-sched" /><ref name="cppnorthkeynote-video" /><ref name="cppnorthkeynote-9to5google" /> The language is expected to have an experimental [[Minimum viable product|MVP]] version 0.1 in 2025late 2026 at the earliest and a production-ready version 1.0 after 20272028.<ref>{{Citation |title=Carbon Language: Roadmap |date=2024-01-11 |url=https://github.com/carbon-language/carbon-lang/blob/trunk/docs/project/roadmap.md |publisher=carbon-language |access-date=2024-01-18}}</ref>

The language intends to fix several perceived shortcomings of C++<ref name="difficulties improving cpp" /> but otherwise provides a similar feature set.

The main goals of the language are readability and "bi-directional interoperability" (which allows the user to include C++ code in the Carbon file), as opposed to using a new language like [[Rust (programming language)|Rust]], that, whilewhilst being influenced by C++, is not two-way compatible with C++ programs. Changes to the language will be decided by the Carbon leads.<ref name="c1" /><ref name="c2" /><ref name="c3" /><ref name="c4" />

Carbon's documents, design, implementation, and related tools are hosted on [[GitHub]] under the [[Apache License|Apache-2.0]] license with [[LLVM]] Exceptions.<ref>{{Cite web |url=https://github.com/carbon-language/carbon-lang/blob/31df852738aea520a1a1800259120bc10ce7a005/LICENSE |title=carbon-lang/LICENSE |date=2020-06-16 |access-date=2022-07-24 |website=GitHub}}</ref>

{{clear}}

==Example==

The following shows how a program might be written in Carbon:<ref>{{cite web |title=carbon-lang/docs/images/snippets.md at trunk · carbon-language/carbon-lang |url=https://github.com/carbon-language/carbon-lang/blob/trunk/docs/images/snippets.md |website=GitHub |access-date=16 December 2023 |language=en}}</ref>

==Example==

The following shows how a program might be written in Carbon and C++:<ref>{{cite web |title=carbon-lang/docs/images/snippets.md at trunk · carbon-language/carbon-lang |url=https://github.com/carbon-language/carbon-lang/blob/trunk/docs/images/snippets.md |website=GitHub |access-date=16 December 2023 |language=en}}</ref>

{{clear}}

<!--

Part of the Carbon Language project, under the Apache License v2.0 with LLVM

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{| class="wikitable"

|-

! Carbon !! C++

|- style=vertical-align:top

| <syntaxhighlight lang="carbon" line="1">

package Geometry api;

import Math;

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var circles: Array(Circle) = ({.r = 1.0}, {.r = 2.0});

// Implicitly converts `Array` to `Slice`.

PrintTotalArea(circles);

return 0;

}

</syntaxhighlight>

| <syntaxhighlight lang="c++" line="1">

#include <vector>

using namespace std;

struct Circle {

float32_t r;

};

void PrintTotalArea(span<Circle> circles)

{

float32_t area = 0;

for (const Circle& c : circles) {

area += numbers::pi * c.r * c.r;

}

print("Total area: {}\n", area);

}

int main() {

vector<Circle> circles{{.r = 1.0}, {.r = 2.0}};

// Implicitly converts `vector` to `span`.

PrintTotalArea(circles);

return 0;

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* [[Go (programming language)|Go]]

* [[Rust (programming language)|Rust]]

* [[Ring (programming language)|Ring]]

* [[Mojo (programming language)|Mojo]]

* [[V (programming language)|V]]

== References ==

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== External links ==

* {{GitHub|carbon-language}}

* [https://docs.carbon-lang.dev/ Carbon language documentation]

* [https://carbon.godbolt.org/ Carbon at the Compiler Explorer (godbolt)]

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[[Category:Object-oriented programming languages]]

[[Category:Programming languages created in 2022]]

[[Category:Google software]]

{{Google-stub}}