chore: move __c_cpp/* to __ffi

__ffi/cpp/Cargo.lock

@@ -0,0 +1,161 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
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+ "lazy_static",
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+ "syn",
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+ "byteorder",
+ "cpp_common",
+ "if_rust_version",
+ "lazy_static",
+ "proc-macro2",
+ "quote",
+ "syn",
+]
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+ "thread_local",
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+[[package]]
+name = "rust_sample_cpp"
+version = "0.1.0"
+dependencies = [
+ "cpp",
+ "cpp_build",
+]
+
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+ "proc-macro2",
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+ "unicode-xid",
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__ffi/cpp/Cargo.toml

@@ -0,0 +1,13 @@
+[package]
+name = "rust_sample_cpp"
+version = "0.1.0"
+authors = ["Hatter Jiang <jht5945@gmail.com>"]
+edition = "2018"
+build = "build.rs"
+
+[dependencies]
+cpp = "0.5.4"
+
+[build-dependencies]
+cpp_build = "0.5.4"
+

__ffi/cpp/build.rs

@@ -0,0 +1,5 @@
+extern crate cpp_build;
+
+fn main() {
+    cpp_build::build("src/main.rs");
+}

__ffi/cpp/src/main.rs

@@ -0,0 +1,16 @@
+#[macro_use]
+extern crate cpp;
+
+cpp!{{
+    #include <stdio.h>
+    #include <iostream>
+}}
+
+fn main() {
+    unsafe {
+        cpp!([] {
+            printf("Hello, World!\n");
+            std::cout << "Hello, World2!" << std::endl;
+        });
+    }
+}