From 445fe6e07e3b8f5343f4a728d7ad96fbbfd0345e Mon Sep 17 00:00:00 2001
From: Mistivia <i@mistivia.com>
Date: Sun, 8 Jun 2025 18:11:12 +0800
Subject: add generic vector

---
 src/vec.c        |  9 +++++++
 src/vec.h        | 77 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 tests/test_vec.c | 22 ++++++++++++++++
 3 files changed, 108 insertions(+)
 create mode 100644 src/vec.c
 create mode 100644 src/vec.h
 create mode 100644 tests/test_vec.c

diff --git a/src/vec.c b/src/vec.c
new file mode 100644
index 0000000..318d328
--- /dev/null
+++ b/src/vec.c
@@ -0,0 +1,9 @@
+#include "vec.h"
+
+#include <string.h>
+
+VECTOR_IMPL(Char);
+VECTOR_IMPL(Int);
+VECTOR_IMPL(Long);
+VECTOR_IMPL(Float);
+VECTOR_IMPL(Double);
diff --git a/src/vec.h b/src/vec.h
new file mode 100644
index 0000000..3bb4014
--- /dev/null
+++ b/src/vec.h
@@ -0,0 +1,77 @@
+#ifndef ALGDS_VEC_H_
+#define ALGDS_VEC_H_
+
+#include <stdlib.h>
+
+#include "type_alias.h"
+
+#define VECTOR_DEF(T) \
+    typedef struct { \
+        T* buffer; \
+        int size; \
+        int cap; \
+    } T##Vector; \
+    \
+    void T##Vector_init(T##Vector *self); \
+    void T##Vector_push_back(T##Vector *self, T *elem); \
+    void T##Vector_insert_before(T##Vector *self, int n, T *elem); \
+    void T##Vector_pop(T##Vector *self); \
+    void T##Vector_remove(T##Vector *self, size_t n); \
+    size_t T##Vector_len(T##Vector *self); \
+    T* T##Vector_begin(T##Vector *self); \
+    T* T##Vector_end(T##Vector *self); \
+    T* T##Vector_ref(T##Vector *self, size_t n); \
+    void T##Vector_free(T##Vector *self);
+
+#define VECTOR_IMPL(T) \
+    void T##Vector_init(T##Vector *self) { \
+        self->buffer = (T*)malloc(sizeof(T) * 16); \
+        self->cap = 16; \
+        self->size = 0; \
+    } \
+    \
+    void T##Vector_push_back(T##Vector *self, T *elem) { \
+        if (self->size + 1 > self->cap) { \
+            self->buffer = realloc(self->buffer, sizeof(T) * self->cap * 2); \
+            self->cap *= 2; \
+        } \
+        memmove(self->buffer + self->size, elem, sizeof(T)); \
+        self->size += 1; \
+    } \
+    void T##Vector_insert_before(T##Vector *self, int n, T *elem) { \
+        if (n < 0 || n > self->size) { \
+            return; \
+        } \
+        if (self->size + 1 > self->cap) { \
+            self->buffer = malloc(sizeof(T) * self->cap * 2); \
+            self->cap *= 2; \
+        } \
+        if (n != self->size) { \
+            memmove(self->buffer + n + 1, \
+                    self->buffer + n, \
+                    sizeof(T) * (self->size - n)); \
+            memmove(self->buffer + n, elem, sizeof(T)); \
+        } \
+    } \
+    void T##Vector_pop(T##Vector *self) { \
+        self->size -= 1; \
+    } \
+    void T##Vector_remove(T##Vector *self, size_t n) { \
+        if (n < 0 || n >= self->size) return; \
+        memmove(self->buffer + n, \
+                self->buffer + n + 1, \
+                sizeof(T) * self->size - n - 1); \
+        self->size -= 1; \
+    } \
+    T* T##Vector_begin(T##Vector *self) { return self->buffer; } \
+    T* T##Vector_end(T##Vector *self) { return self->buffer + self->size; } \
+    T* T##Vector_ref(T##Vector *self, size_t n) { return self->buffer + n; } \
+    void T##Vector_free(T##Vector *self) { free(self->buffer); }
+
+VECTOR_DEF(Char);
+VECTOR_DEF(Int);
+VECTOR_DEF(Long);
+VECTOR_DEF(Float);
+VECTOR_DEF(Double);
+
+#endif
diff --git a/tests/test_vec.c b/tests/test_vec.c
new file mode 100644
index 0000000..4cbc96f
--- /dev/null
+++ b/tests/test_vec.c
@@ -0,0 +1,22 @@
+#include "vec.h"
+
+#include <assert.h>
+#include <stdio.h>
+
+int main() {
+    printf("[TEST] vec\n");
+
+    IntVector vec;
+    IntVector_init(&vec);
+
+    for (int i = 0; i < 1000; i++) {
+        assert(vec.size == i);
+        IntVector_push_back(&vec, &i);
+        assert(*(IntVector_end(&vec) - 1) == i);
+    }
+    assert(*IntVector_begin(&vec) == 0);
+
+    IntVector_free(&vec);
+    printf("[PASS] vec\n");
+    return 0;
+}
-- 
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