From 9da4c9bc53b0b2ddf6171757b6d9b3fb705642ac Mon Sep 17 00:00:00 2001
From: kunitoki <kunitoki@gmail.com>
Date: Sun, 1 Dec 2024 09:47:32 +0100
Subject: [PATCH] Make Identifier usable from associative containers (#27)

---
 modules/juce_core/text/juce_Identifier.h | 16 ++++++++++++++++
 tests/juce_core/juce_Identifier.cpp      | 12 ++++++++++++
 2 files changed, 28 insertions(+)

diff --git a/modules/juce_core/text/juce_Identifier.h b/modules/juce_core/text/juce_Identifier.h
index 96af6116..519897e2 100644
--- a/modules/juce_core/text/juce_Identifier.h
+++ b/modules/juce_core/text/juce_Identifier.h
@@ -147,3 +147,19 @@ class JUCE_API Identifier final
 };
 
 } // namespace juce
+
+#ifndef DOXYGEN
+namespace std
+{
+
+template <>
+struct hash<juce::Identifier>
+{
+    size_t operator() (const juce::Identifier& identifier) const noexcept
+    {
+        return static_cast<size_t> (*reinterpret_cast<uintptr_t*> (identifier.getCharPointer().getAddress()));
+    }
+};
+
+} // namespace std
+#endif
diff --git a/tests/juce_core/juce_Identifier.cpp b/tests/juce_core/juce_Identifier.cpp
index 9caa8aa8..712c3896 100644
--- a/tests/juce_core/juce_Identifier.cpp
+++ b/tests/juce_core/juce_Identifier.cpp
@@ -23,6 +23,8 @@
 
 #include <juce_core/juce_core.h>
 
+#include <unordered_map>
+
 using namespace juce;
 
 TEST (Identifier, DefaultConstructorCreatesNullIdentifier)
@@ -110,3 +112,13 @@ TEST (Identifier, ConversionToCharPointer)
     auto ptr = id.getCharPointer();
     EXPECT_STREQ (ptr.getAddress(), "pointer");
 }
+
+TEST (Identifier, UseInAssociativeContainers)
+{
+    std::unordered_map<Identifier, Identifier> ids;
+    ids[Identifier("test1")] = Identifier("test2");
+
+    ASSERT_TRUE(ids.find(Identifier("test1")) != ids.end());
+    EXPECT_EQ(ids.find(Identifier("test1"))->first, Identifier("test1"));
+    EXPECT_EQ(ids.find(Identifier("test1"))->second, Identifier("test2"));
+}