From e4c7e04230baf56def5826fa5d8d88547d8c68af Mon Sep 17 00:00:00 2001
From: =?utf8?q?=EB=B0=95=EC=A2=85=ED=98=84/=EB=8F=99=EC=9E=91=EC=A0=9C?=
 =?utf8?q?=EC=96=B4Lab=28SR=29/Staff=20Engineer/=EC=82=BC=EC=84=B1?=
 =?utf8?q?=EC=A0=84=EC=9E=90?= <jh1302.park@samsung.com>
Date: Mon, 9 Jul 2018 13:43:48 +0900
Subject: [PATCH] Add 'stdex' project (#562)

This commit introduces 'stdex' project which provides an extension over
standard C++ libraries.

The current version includes diff operator overloading over two sets.

Signed-off-by: Jonghyun Park <jh1302.park@samsung.com>

* Use set instead of Set.h
---
 contrib/stdex/.FORMATCHECKED    |  0
 contrib/stdex/CMakeLists.txt    | 15 +++++++++++++++
 contrib/stdex/include/stdex/set | 21 +++++++++++++++++++++
 contrib/stdex/src/Set.test.cpp  | 15 +++++++++++++++
 4 files changed, 51 insertions(+)
 create mode 100644 contrib/stdex/.FORMATCHECKED
 create mode 100644 contrib/stdex/CMakeLists.txt
 create mode 100644 contrib/stdex/include/stdex/set
 create mode 100644 contrib/stdex/src/Set.test.cpp

diff --git a/contrib/stdex/.FORMATCHECKED b/contrib/stdex/.FORMATCHECKED
new file mode 100644
index 0000000..e69de29
diff --git a/contrib/stdex/CMakeLists.txt b/contrib/stdex/CMakeLists.txt
new file mode 100644
index 0000000..9e9a787
--- /dev/null
+++ b/contrib/stdex/CMakeLists.txt
@@ -0,0 +1,15 @@
+file(GLOB_RECURSE TESTS "src/*.test.cpp")
+
+add_library(stdex INTERFACE)
+target_include_directories(stdex INTERFACE include)
+
+nncc_find_package(GTest QUIET)
+
+if(NOT GTest_FOUND)
+  return()
+endif(NOT GTest_FOUND)
+
+add_executable(stdex_test ${TESTS})
+target_link_libraries(stdex_test stdex)
+target_link_libraries(stdex_test gtest_main)
+add_test(stdex_test stdex_test)
diff --git a/contrib/stdex/include/stdex/set b/contrib/stdex/include/stdex/set
new file mode 100644
index 0000000..0273935
--- /dev/null
+++ b/contrib/stdex/include/stdex/set
@@ -0,0 +1,21 @@
+#ifndef __STDEX_SET_H__
+#define __STDEX_SET_H__
+
+#include <set>
+
+template <typename T> std::set<T> operator-(const std::set<T> &lhs, const std::set<T> &rhs)
+{
+  std::set<T> res;
+
+  for (const auto &element : lhs)
+  {
+    if (rhs.find(element) == rhs.end())
+    {
+      res.insert(element);
+    }
+  }
+
+  return res;
+}
+
+#endif // __STDEX_SET_H__
diff --git a/contrib/stdex/src/Set.test.cpp b/contrib/stdex/src/Set.test.cpp
new file mode 100644
index 0000000..689a261
--- /dev/null
+++ b/contrib/stdex/src/Set.test.cpp
@@ -0,0 +1,15 @@
+#include "stdex/set"
+
+#include <gtest/gtest.h>
+
+TEST(SET, operator_diff)
+{
+  const std::set<int> lhs{1, 2, 3};
+  const std::set<int> rhs{2, 4};
+
+  auto res = lhs - rhs;
+
+  ASSERT_EQ(res.size(), 2);
+  ASSERT_NE(res.find(1), res.end());
+  ASSERT_NE(res.find(3), res.end());
+}
-- 
2.7.4