carbon-lang

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Boaz Brickner f0cff612eb Add support for using C++ double type in imported function declarations (#5868 )

Carbon only supports f64, so only double can be mapped.

https://github.com/carbon-language/carbon-lang/blob/30f0ddab71bda71f8789080962b1fe8a5938e327/toolchain/check/type.cpp#L54

C++ Interop Demo:

```c++
// hello_world.h

auto hello_world(double x) -> void;
```

```c++
// hello_world.cpp

#include "hello_world.h"

#include <cstdio>

auto hello_world(double x) -> void {
  printf("double: %f\n", x);
}
```

```carbon
// main.carbon

library "Main";

import Cpp library "hello_world.h";

fn Run() -> i32 {
  Cpp.hello_world(0.25);
  return 0;
}
```

```shell
$ clang -c hello_world.cpp
$ bazel-bin/toolchain/carbon compile main.carbon
$ bazel-bin/toolchain/carbon link hello_world.o main.o --output=demo
$ $ ./demo
double: 0.250000
```

Before this change:

```shell
$ bazel-bin/toolchain/carbon compile main.carbon
main.carbon:8:3: error: semantics TODO: `Unsupported: parameter type: double`
  Cpp.hello_world(0.25);
  ^~~~~~~~~~~~~~~
main.carbon:8:3: note: in `Cpp` name lookup for `hello_world`
  Cpp.hello_world(0.25);
  ^~~~~~~~~~~~~~~
```

Part of #5263.

2025-07-30 07:13:59 +00:00

arithmetic_types_bridged.carbon

Add support for using C++ double type in imported function declarations (#5868 )

2025-07-30 07:13:59 +00:00

arithmetic_types_direct.carbon

Interop: support all C++ integer types that map to intN_t or uintN_t. (#5836 )

2025-07-22 21:29:09 +00:00

class.carbon

Add support for importing access from C++ to Carbon (#5858 )

2025-07-29 08:25:15 +00:00

full_semir.carbon

Expand naming for impls and functions (#5808 )