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https://github.com/carbon-language/carbon-lang.git
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Boaz Brickner
471b394c6d
Newly supported: `-`.
Partially supported due to lack of reference support: `++` (prefix),
`--` (prefix).
Not supported due to lack of Carbon support to call them correctly: `+`,
`++` (postfix), `--` (postfix), `~`, `!`, `&`, `*`, `->`.
Also (for consistency):
* Add the operator declarations to unsupported binary operators tests.
* Logical operators and the unary `operator&` (address of) are expected
to be called by explicitly calling `operatorX`.
C++ Interop Demo:
```c++
// my_number.h
class MyNumber {
public:
explicit MyNumber(int value) : value_(value) {}
auto value() const -> int { return value_; }
private:
int value_;
};
auto operator++(MyNumber operand) -> MyNumber;
auto operator--(MyNumber operand) -> MyNumber;
auto operator-(MyNumber operand) -> MyNumber;
```
```c++
// my_number.cpp
#include "my_number.h"
auto operator++(MyNumber operand) -> MyNumber {
return MyNumber(operand.value() + 1);
}
auto operator--(MyNumber operand) -> MyNumber {
return MyNumber(operand.value() - 1);
}
auto operator-(MyNumber operand) -> MyNumber {
return MyNumber(-operand.value());
}
```
```carbon
// main.carbon
library "Main";
import Core library "io";
import Cpp library "my_number.h";
fn Run() -> i32 {
var num: Cpp.MyNumber = Cpp.MyNumber.MyNumber(14);
Core.Print(num.value());
++num;
Core.Print(num.value());
--num;
Core.Print(num.value());
num = -num;
Core.Print(num.value());
return 0;
}
```
```shell
$ clang -c my_number.cpp
$ bazel-bin/toolchain/carbon compile main.carbon
$ bazel-bin/toolchain/carbon link my_number.o main.o --output=demo
$ ./demo
14
14
14
-14
```
Part of https://github.com/carbon-language/carbon-lang/issues/5995.