From 2153d678704bd2e815ba88671c6cdebd74ba91de Mon Sep 17 00:00:00 2001
From: Stephen Berry <stephenberry.developer@gmail.com>
Date: Mon, 30 Sep 2024 09:24:21 -0500
Subject: [PATCH] Update generic-json.md

---
 docs/generic-json.md | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/docs/generic-json.md b/docs/generic-json.md
index 501436604d..4e2db1802e 100644
--- a/docs/generic-json.md
+++ b/docs/generic-json.md
@@ -66,3 +66,24 @@ glz::write_json(v, s);
 expect(s == R"([0,1,2])");
 ```
 
+## Using `json_t` As The Source
+
+After parsing into a `json_t` it is sometimes desirable to parse into a concrete struct or a portion of the `json_t` into a struct. Glaze allows a `json_t` value to be used as the source where a buffer would normally be passed.
+
+```c++
+glz::json_t json = glz::read_json<glz::json_t>(R"({"foo":"bar"})");
+expect(json->contains("foo"));
+auto obj = glz::read_json<std::map<std::string, std::string>>(json.value());
+// This reads the json_t into a std::map
+```
+
+Another example:
+
+```c++
+glz::json_t json{};
+expect(not glz::read_json(json, R"("Beautiful beginning")"));
+std::string v{};
+expect(not glz::read<glz::opts{}>(v, json));
+expect(v == "Beautiful beginning");
+```
+