From 350a6e397f544d3c5444cbfd79d672b34cfd268c Mon Sep 17 00:00:00 2001
From: Felix Morgner <felix.morgner@gmail.com>
Date: Thu, 2 Jan 2020 15:36:00 +0100
Subject: new_type: implement subtract-assign

---
 doc/src/index.rst | 9 +++++++++
 1 file changed, 9 insertions(+)

(limited to 'doc')

diff --git a/doc/src/index.rst b/doc/src/index.rst
index 2694dba..591a168 100644
--- a/doc/src/index.rst
+++ b/doc/src/index.rst
@@ -302,6 +302,15 @@ Arithmetic Operators
 
    **enablement:** This operator shall be available iff. a) :cpp:type:`new_type<BaseType, TagType, DerivationClause>::base_type` is subtractable using the operator :literal:`-` and b) :cpp:type:`DerivationClause` includes :cpp:var:`Arithmetic`.
 
+.. cpp:function:: template<typename BaseType, \
+                  typename TagType, \
+                  auto DerivationClause> \
+                  constexpr new_type<BaseType, TagType, DerivationClause> & operator-=(new_type<BaseType, TagType, DerivationClause> const & lhs, new_type<BaseType, TagType, DerivationClause> const & rhs)
+
+   **noexcept specification:** This operator shall be noexcept iff. :cpp:type:`new_type<BaseType, TagType, DerivationClause>::base_type` is nothrow subtract-assignable.
+
+   **enablement:** This operator shall be available iff. a) :cpp:type:`new_type<BaseType, TagType, DerivationClause>::base_type` is subtract-assignable using the operator :literal:`-=` and b) :cpp:type:`DerivationClause` includes :cpp:var:`Arithmetic`.
+
 .. cpp:function:: template<typename BaseType, \
                   typename TagType, \
                   auto DerivationClause> \
-- 
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