From 88640e677fa0695783eac68014d7d8d5bc42d117 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Mon, 19 Feb 2024 12:23:10 +0200
Subject: Add string_set buildfile value type

This exposes the std::set<std::string> type to buildfiles.

New functions:

  $size(<string-set>)

Subscript returns true if the value is present and false otherwise (so
it is mapped to std::set::contains()). For example:

set = [string_set] a b c

if ($set[b])
  ...

Note that append (+=) and prepend (=+) have the same semantics
(std::set::insert()). For example:

set = [string_set] a b
set += c b              # a b c
set =+ d b              # a b c d

Example of iteration:

set = [string_set] a b c
for k: $set
  ...
---
 libbuild2/parser.cxx | 1 +
 1 file changed, 1 insertion(+)

(limited to 'libbuild2/parser.cxx')

diff --git a/libbuild2/parser.cxx b/libbuild2/parser.cxx
index b68f009..bf806be 100644
--- a/libbuild2/parser.cxx
+++ b/libbuild2/parser.cxx
@@ -6101,6 +6101,7 @@ namespace build2
           if (n[6] == '\0') return &value_traits<string>::value_type;
           if (n[6] == 's' &&
               n[7] == '\0') return &value_traits<strings>::value_type;
+          if (n == "string_set") return &value_traits<set<string>>::value_type;
           if (n == "string_map")
             return &value_traits<map<string,string>>::value_type;
         }
-- 
cgit v1.1