From 2f2317552c1fb3ba6e164edc90eb882e47f7f47a Mon Sep 17 00:00:00 2001
From: Alexandru Razvan Caciulescu <alexandru.razvan.c@gmail.com>
Date: Thu, 30 Mar 2017 22:51:01 +0300
Subject: [PATCH] WIP: stl_pair

---
 mak/COPY                   |  1 +
 mak/DOCS                   |  1 +
 src/core/stdcpp/stl_pair.d | 65 ++++++++++++++++++++++++++++++++++++++
 3 files changed, 67 insertions(+)
 create mode 100644 src/core/stdcpp/stl_pair.d

diff --git a/mak/COPY b/mak/COPY
index 3b5fa33d98..44b4e349ad 100644
--- a/mak/COPY
+++ b/mak/COPY
@@ -46,6 +46,7 @@ COPY=\
 	\
 	$(IMPDIR)\core\stdcpp\typeinfo.d \
 	$(IMPDIR)\core\stdcpp\exception.d \
+	$(IMPDIR)\core\stdcpp\stl_pair.d \
 	\
 	$(IMPDIR)\core\sys\darwin\execinfo.d \
 	$(IMPDIR)\core\sys\darwin\pthread.d \
diff --git a/mak/DOCS b/mak/DOCS
index c7f630d1ca..b2beccf308 100644
--- a/mak/DOCS
+++ b/mak/DOCS
@@ -38,6 +38,7 @@ DOCS=\
 	\
 	$(DOCDIR)\core_stdcpp_exception.html \
 	$(DOCDIR)\core_stdcpp_typeinfo.html \
+	$(DOCDIR)\core_stdcpp_stl_pair.html \
 	\
 	$(DOCDIR)\core_sync_barrier.html \
 	$(DOCDIR)\core_sync_condition.html \
diff --git a/src/core/stdcpp/stl_pair.d b/src/core/stdcpp/stl_pair.d
new file mode 100644
index 0000000000..be535b0796
--- /dev/null
+++ b/src/core/stdcpp/stl_pair.d
@@ -0,0 +1,65 @@
+module core.stdcpp.stl_pair;
+
+version (CRuntime_Glibc) {
+	extern (C++, std) struct pair(T1, T2) {
+
+		alias first_type = T1;
+		alias second_type = T2;
+
+		T1 first;
+		T2 second;
+
+		this(T1 x, T2 y) { first = x; second = y; }
+
+		this(U1, U2)(auto ref U1 x, auto ref U2 y) {
+			if (isConvertible!(U1, T1) && isConvertible!(U2, T2)) {
+				first = x;
+				second = y;
+			}
+		}
+
+		this(U1, U2)(auto ref pair!(U1,  U2) p) {
+			first = p.first; second = p.second;
+		}
+
+		this(U1, U2)(auto ref const pair!(U1,  U2) p) {
+			first = p.first; second = p.second;
+		}
+
+		void swap(ref pair rhs);
+
+		void opAssign(U1, U2)(auto ref pair!(U1, U2) rhs) {
+			first = rhs.first;
+			second = rhs.second;
+		}
+
+		void opAssign(U1, U2)(auto ref const pair!(U1, U2) rhs) {
+			first = rhs.first;
+			second = rhs.second;
+		}
+
+		bool opEquals(P)(auto ref P rhs) {
+			return first == rhs.first && second == rhs.second;
+		}
+
+		bool opEquals(P)(auto ref P rhs) const {
+			return first == rhs.first && second == rhs.second;
+		}
+
+		int opCmp(P)(auto ref P rhs) {
+			if (first < rhs.first) return -1;
+			if (first > rhs.first) return 1;
+			return second < rhs.second ? -1 : second > rhs.second;
+		}
+		int opCmp(P)(auto ref P rhs) const {
+			if (first < rhs.first) return -1;
+			if (first > rhs.first) return 1;
+			return second < rhs.second ? -1 : second > rhs.second;
+		}
+
+		// WIP: attempt just link without implementation, mangling issues
+		pair!(T1, T2) make_pair(T1, T2)(auto ref T1 v1, auto ref T2 v2)
+		{ return pair!(T1, T2)(v1, v2);}
+
+	}
+}