From baecb524fb2b8162409d86d84cdddbd20b930c50 Mon Sep 17 00:00:00 2001
From: hachem <im@hachem.wtf>
Date: Sun, 6 Sep 2026 21:06:02 +0200
Subject: add: classical bits and registers

---
 include/core/classical_components.h | 21 +++++++++++++++++++++
 src/core/classical_components.c     | 36 ++++++++++++++++++++++++++++++++++++
 tester/main.c                       | 11 +++++++++++
 3 files changed, 68 insertions(+)
 create mode 100644 include/core/classical_components.h
 create mode 100644 src/core/classical_components.c

diff --git a/include/core/classical_components.h b/include/core/classical_components.h
new file mode 100644
index 0000000..48714b4
--- /dev/null
+++ b/include/core/classical_components.h
@@ -0,0 +1,21 @@
+#pragma once
+
+#include <stdbool.h>
+#include <stddef.h>
+
+struct PsiClassicalBit
+{
+	const char *name;
+	bool state;
+};
+
+struct PsiClassicalRegister
+{
+	const char *name;
+	struct PsiClassicalBit *bits;
+	size_t num_bits;
+};
+
+struct PsiClassicalBit psi_new_classical_bit(const char *name, bool state);
+struct PsiClassicalRegister psi_new_classical_register(const char *name, const char **names, size_t count);
+void psi_free_classical_register(struct PsiClassicalRegister *reg);
diff --git a/src/core/classical_components.c b/src/core/classical_components.c
new file mode 100644
index 0000000..836784c
--- /dev/null
+++ b/src/core/classical_components.c
@@ -0,0 +1,36 @@
+#include "core/classical_components.h"
+
+#include <assert.h>
+#include <stdlib.h>
+
+struct PsiClassicalBit psi_new_classical_bit(const char *name, bool state)
+{
+	return (struct PsiClassicalBit)
+	{
+		name,
+		state,
+	};
+}
+
+struct PsiClassicalRegister psi_new_classical_register(const char *name, const char **names, size_t count)
+{
+	struct PsiClassicalBit *bits = malloc(count * sizeof(struct PsiClassicalBit));
+	assert(bits != NULL || count == 0);
+
+	for (size_t i = 0; i < count; i++)
+		bits[i] = psi_new_classical_bit(names[i], false);
+
+	return (struct PsiClassicalRegister)
+	{
+		name,
+		bits,
+		count,
+	};
+}
+
+void psi_free_classical_register(struct PsiClassicalRegister *reg)
+{
+	free(reg->bits);
+	reg->bits = NULL;
+	reg->num_bits = 0;
+}
diff --git a/tester/main.c b/tester/main.c
index e401288..13c9257 100644
--- a/tester/main.c
+++ b/tester/main.c
@@ -1,5 +1,6 @@
 #include <stdio.h>
 
+#include "core/classical_components.h"
 #include "core/custom_gate.h"
 #include "core/gates.h"
 #include "core/quantum_components.h"
@@ -117,5 +118,15 @@ int main(void)
 	psi_free_quantum_gate(&bell_gate);
 	psi_free_quantum_register(&reg2);
 
+	const char *cnames[] = { "c0", "c1" };
+	struct PsiClassicalRegister creg = psi_new_classical_register("c", cnames, 2);
+	creg.bits[1].state = true;
+
+	printf("creg    = %s=%d %s=%d\n",
+		creg.bits[0].name, creg.bits[0].state,
+		creg.bits[1].name, creg.bits[1].state);
+
+	psi_free_classical_register(&creg);
+
 	return 0;
 }
-- 
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