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examples/interop/cpp/hello_world.carbon
53 строки
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Richard Smith
Allow conversion between `T*` and `Cpp.void*`. (#6575)
12 янв 2026, 19:32
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12 янв 2026, 19:32
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// Part of the Carbon Language project, under the Apache License v2.0 with LLVM // Exceptions. See /LICENSE for license information. // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception import Cpp library "<cstdio>"; import Cpp library "<iostream>"; import Cpp library "<string_view>"; import Cpp library "<unistd.h>"; // Demonstrate passing `char`s to a C++ function. fn HelloPutchar() { let message: array(char, 13) = ('H', 'e', 'l', 'l', 'o', ' ', 'w', 'o', 'r', 'l', 'd', '!', '\n'); for (c: char in message) { // TODO: u8 should probably have an implicit cast to i32. Cpp.putchar((c as u8) as i32); } // TODO: Use a loop over a string literal instead. Requires IndexWith support // for str. // // let message: str = "Hello world!\n"; // for (c: char in message) { // Cpp.putchar((c as u8) as i32); // } } // Demonstrate passing a null-terminated string to a C++ function. fn HelloStdio() { // TODO: There should be a better way to interact with functions that expect a // null-terminated string. Cpp.puts(Cpp.std.data("Hello world!\0")); // TODO: Requires variadic function support. // Cpp.printf("Hello world!\n\0"); } // Demonstrate passing a string as a void pointer to a C++ function. fn HelloWrite() { let s: str = "Hello world!\n"; Cpp.write(1, Cpp.std.data(s), Cpp.std.size(s)); } fn HelloIostreams() { Cpp.std.cout << "Hello world!\n"; } fn Run() { HelloPutchar(); HelloStdio(); HelloWrite(); HelloIostreams(); }