From 00fe33d2f369264a0e440a7f63319cc734088bb0 Mon Sep 17 00:00:00 2001
From: Andreas Buhr <andreas.buhr@3ds.com>
Date: Mon, 24 Nov 2025 14:28:58 +0100
Subject: [PATCH] add "constexpr" to switch_parser constructor

so switch(predicate)(valA, parserA)(valB, parserB)
can result in a constexpr object.
---
 include/boost/parser/parser.hpp | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/include/boost/parser/parser.hpp b/include/boost/parser/parser.hpp
index 539025bf..cc3d80c6 100644
--- a/include/boost/parser/parser.hpp
+++ b/include/boost/parser/parser.hpp
@@ -8525,9 +8525,9 @@ namespace boost { namespace parser {
     template<typename SwitchValue, typename OrParser>
     struct switch_parser
     {
-        switch_parser() {}
-        switch_parser(SwitchValue switch_value) : switch_value_(switch_value) {}
-        switch_parser(SwitchValue switch_value, OrParser or_parser) :
+        constexpr switch_parser() {}
+        constexpr switch_parser(SwitchValue switch_value) : switch_value_(switch_value) {}
+        constexpr switch_parser(SwitchValue switch_value, OrParser or_parser) :
             switch_value_(switch_value), or_parser_(or_parser)
         {}