Move all examples into Bazel workspace

Those examples will be used for Bazel integration tests and their
sources should be available directly to the Bazel workspace itself.

--
MOS_MIGRATED_REVID=89380736

6 files changed, 121 insertions, 0 deletions

diff --git a/examples/cpp/BUILD b/examples/cpp/BUILD
new file mode 100644
index 0000000000..195bbb3d25
--- /dev/null
+++ b/examples/cpp/BUILD
@@ -0,0 +1,25 @@
+package(default_visibility = ["//visibility:public"])
+
+cc_library(
+    name = "hello-lib",
+    srcs = ["hello-lib.cc"],
+    hdrs = ["hello-lib.h"],
+)
+
+cc_binary(
+    name = "hello-world",
+    srcs = ["hello-world.cc"],
+    deps = [":hello-lib"],
+)
+
+cc_test(
+    name = "hello-success_test",
+    srcs = ["hello-world.cc"],
+    deps = [":hello-lib"],
+)
+
+cc_test(
+    name = "hello-fail_test",
+    srcs = ["hello-fail.cc"],
+    deps = [":hello-lib"],
+)
diff --git a/examples/cpp/README.md b/examples/cpp/README.md
new file mode 100644
index 0000000000..fba714321c
--- /dev/null
+++ b/examples/cpp/README.md
@@ -0,0 +1,4 @@
+C++ Examples
+============
+
+These examples demonstrate building C++ binaries, libraries, and tests.
diff --git a/examples/cpp/hello-fail.cc b/examples/cpp/hello-fail.cc
new file mode 100644
index 0000000000..5b561cb0ce
--- /dev/null
+++ b/examples/cpp/hello-fail.cc
@@ -0,0 +1,22 @@
+#include "examples/cpp/hello-lib.h"
+
+#include <string>
+
+using hello::HelloLib;
+using std::string;
+
+/**
+ * This is a fake test that prints "Hello barf" and then exits with exit code 1.
+ * If run as a test (cc_test), the non-0 exit code indicates to Bazel that the
+ * "test" has failed.
+ */
+int main(int argc, char** argv) {
+  HelloLib lib;
+  string thing = "barf";
+  if (argc > 1) {
+    thing = argv[1];
+  }
+
+  lib.greet(thing);
+  return 1;
+}
diff --git a/examples/cpp/hello-lib.cc b/examples/cpp/hello-lib.cc
new file mode 100644
index 0000000000..8e40921cee
--- /dev/null
+++ b/examples/cpp/hello-lib.cc
@@ -0,0 +1,21 @@
+#include "examples/cpp/hello-lib.h"
+
+#include <iostream>
+
+using std::cout;
+using std::endl;
+using std::string;
+
+namespace hello {
+
+HelloLib::HelloLib() : HelloLib("Hello") {
+}
+
+HelloLib::HelloLib(const string& greeting) : greeting_(new string(greeting)) {
+}
+
+void HelloLib::greet(const string& thing) {
+  cout << *greeting_ << " " << thing << endl;
+}
+
+}  // namespace hello
diff --git a/examples/cpp/hello-lib.h b/examples/cpp/hello-lib.h
new file mode 100644
index 0000000000..555d177936
--- /dev/null
+++ b/examples/cpp/hello-lib.h
@@ -0,0 +1,23 @@
+#ifndef EXAMPLES_CPP_HELLO_LIB_H_
+#define EXAMPLES_CPP_HELLO_LIB_H_
+
+#include <string>
+#include <memory>
+
+namespace hello {
+
+class HelloLib {
+ public:
+  HelloLib();
+
+  explicit HelloLib(const std::string &greeting);
+
+  void greet(const std::string &thing);
+
+ private:
+  std::unique_ptr<const std::string> greeting_;
+};
+
+}  // namespace hello
+
+#endif  // EXAMPLES_CPP_HELLO_LIB_H_
diff --git a/examples/cpp/hello-world.cc b/examples/cpp/hello-world.cc
new file mode 100644
index 0000000000..be435c3256
--- /dev/null
+++ b/examples/cpp/hello-world.cc
@@ -0,0 +1,26 @@
+#include "examples/cpp/hello-lib.h"
+
+#include <string>
+
+using hello::HelloLib;
+using std::string;
+
+/**
+ * This prints "Hello world". If it is run with arguments, it will use the first
+ * argument instead of "world". Build and run //examples/cpp:hello-world to see
+ * this program in action.
+ *
+ * This file does double-duty as a "test." It is a cc_binary, so it can also be
+ * compiled as a cc_test and Bazel will decide on whether it passed or failed
+ * based on exit code (which is always 0 here, so the test "passes"). See
+ * hello-fail.cc for an example of making a test fail.
+ */
+int main(int argc, char** argv) {
+  HelloLib lib("Hello");
+  string thing = "world";
+  if (argc > 1) {
+    thing = argv[1];
+  }
+  lib.greet(thing);
+  return 0;
+}