From ec7d50f052589e44da651c447f8c87ef5b4a41a2 Mon Sep 17 00:00:00 2001
From: Roland Conybeare <rconybeare@gmail.com>
Date: Tue, 6 Aug 2024 09:33:03 -0400
Subject: [PATCH] xo-tokenizer: feat: + span::operator+=

---
 include/xo/tokenizer/span.hpp | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/include/xo/tokenizer/span.hpp b/include/xo/tokenizer/span.hpp
index 36353a63..00f8cf74 100644
--- a/include/xo/tokenizer/span.hpp
+++ b/include/xo/tokenizer/span.hpp
@@ -93,6 +93,16 @@ namespace xo {
             /** @brief report the number of elements (of type CharT) in this span. **/
             size_type size() const { return hi_ - lo_; }
 
+            span & operator+=(const span & x) {
+                if (hi_ == x.lo_) {
+                    hi_ = x.hi_;
+                } else {
+                    assert(false);
+                }
+
+                return *this;
+            }
+
             /** print representation for this span on stream @p os **/
             void print(std::ostream & os) const {
                 os << "<span"