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The c++ programming on serenityos

The AK library of serenityos has implemented c++ concepts library.

c++ :

hello.cpp

#include <AK/Format.h>
#include <AK/BufferedStream.h>

namespace my_space
{
    class A {};
    class B: virtual public A {};
    class C {};
}

int main()
{
    static_assert(AK::Concepts::SameAs<int, int>);
    static_assert(! AK::Concepts::SameAs<const int, int>);

    constexpr auto x = AK::Concepts::SameAs<const int, int>?true:false;
    AK::out("result: {}\n", x);

    static_assert(AK::Concepts::DerivedFrom<my_space::B, my_space::A>);
    static_assert(! AK::Concepts::DerivedFrom<my_space::C, my_space::A>);

    // AK::Detail::RemoveCVReference is a c++ concept too
    using t1 = AK::Detail::RemoveCVReference<int const volatile &>;
    static_assert(AK::Concepts::SameAs<t1, int>);

    AK::Variant<int, const char *> v = 23;
    AK::out("=>{}\n", v.get<int>());
    v = "Hello, AK!";
    AK::out("=>{}\n", v.get<const char *>());

    // AK::SeekableStreamLike is a c++ concept too
    static_assert(AK::SeekableStreamLike<AK::SeekableStream>);
    using my_stream = AK::OutputBufferedSeekable<AK::SeekableStream>;
}

Compile and run it:

courage:~ $ g++ hello.cpp -std=c++23 -lgcc_s -o hello
courage:~ $ ./hello
result: false
=>23
=>Hello, AK!

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c++ std::exception:

std::cout.write(err.data(), err.size());

std::cout << std::endl;

caught:

  ===================================
  #  The c++ programming language.  #
  #                                 #
  #  Join c++ Discord: yZcauUAUyC   #
  #  Deck                           #
  ===================================

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