From 600563d272b150353e52be81a7988a7686ffb373 Mon Sep 17 00:00:00 2001
From: Jason Volk <jason@zemos.net>
Date: Thu, 19 Jan 2023 11:19:24 -0800
Subject: [PATCH] ircd::conf: Add template lex_cast convenience; limited to
 bool specialization.

---
 include/ircd/conf.h |  5 +++++
 ircd/conf.cc        | 30 ++++++++++++++++++++++++++++++
 2 files changed, 35 insertions(+)

diff --git a/include/ircd/conf.h b/include/ircd/conf.h
index 6c7068e0f..b53cbbd18 100644
--- a/include/ircd/conf.h
+++ b/include/ircd/conf.h
@@ -70,6 +70,11 @@ namespace ircd::conf
 	string_view get(const mutable_buffer &out, const string_view &key);
 	std::string get(const string_view &key);
 
+	template<class T> T as(const string_view &key, T def);
+	template<class T> T as(const string_view &key);
+	template<> bool as(const string_view &key, bool def);
+	template<> bool as(const string_view &key);
+
 	bool set(const string_view &key, const string_view &value);
 	bool set(std::nothrow_t, const string_view &key, const string_view &value);
 
diff --git a/ircd/conf.cc b/ircd/conf.cc
index 737174888..9e909d204 100644
--- a/ircd/conf.cc
+++ b/ircd/conf.cc
@@ -155,6 +155,36 @@ catch(const std::out_of_range &e)
 	};
 }
 
+template<>
+bool
+ircd::conf::as(const string_view &key)
+{
+	char buf[5]; // "true" or "false"
+	const auto val
+	{
+		get(buf, key)
+	};
+
+	return lex_cast<bool>(val);
+}
+
+template<>
+bool
+ircd::conf::as(const string_view &key,
+               bool def)
+{
+	char buf[5]; // "true" or "false"
+	const auto val
+	{
+		get(std::nothrow, buf, key)
+	};
+
+	if(val && ircd::lex_castable<bool>(val))
+		def = lex_cast<bool>(val);
+
+	return def;
+}
+
 std::string
 ircd::conf::get(const string_view &key)
 try