From a2b31dfd28b96a7d2646f356a596a6b6e1bb6ead Mon Sep 17 00:00:00 2001
From: King_DuckZ <king_duckz@gmx.com>
Date: Mon, 13 Apr 2020 19:04:28 +0200
Subject: [PATCH] Add missing is_set() implementation.

---
 src/env_real.cpp | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/src/env_real.cpp b/src/env_real.cpp
index 1bfcfdd..63d7933 100644
--- a/src/env_real.cpp
+++ b/src/env_real.cpp
@@ -263,6 +263,17 @@ void EnvReal::unset (std::string_view name) noexcept {
 }
 
 bool EnvReal::is_set (std::string_view name) const noexcept {
+	auto& pm = pointer_map();
+	std::lock_guard<std::mutex> lock(pm.env_mutex());
+
+	return duck::invoke_with_zstr(
+		name,
+		m_name_buff.get(),
+		m_name_buff_len,
+		[](const char* name, std::size_t) -> bool {
+			return nullptr == name;
+		}
+	);
 }
 
 auto EnvReal::size() const noexcept -> size_type {