Add function to get capacity of a vector

3 files changed, 27 insertions, 1 deletions

diff --git a/collections/vector/vector.adoc b/collections/vector/vector.adoc
index 76c0f7a..f1e29e2 100644
--- a/collections/vector/vector.adoc
+++ b/collections/vector/vector.adoc
@@ -1,7 +1,7 @@
 Vector
 ======
 Tucker Evans
-v0.7.2, 2020-07-03
+v0.8, 2020-07-03
 
 A basic vector, that hold pointers to your data structures.
 
@@ -65,6 +65,21 @@ vec_push_back(vector, NULL);
 assert(vec_size(vector) == 1);
 ----
 
++int vec_capacity(vec *self)+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+Returns the maximun number of elements in vector +self+ before the buffer needs
+to be resized (does not take the current size into consideration).
+
+Examples
+^^^^^^^^
+[source,c]
+----
+#include "vector.h"
+
+vec *vector = vec_with_capacity(16);
+assert(vec_capacity(vector) == 16);
+----
+
 [[vec_cp]]
 +vec* vec_cp(vec *self)+
 ~~~~~~~~~~~~~~~~~~~~~~~~
diff --git a/collections/vector/vector.c b/collections/vector/vector.c
index 23e5c47..b8f83de 100644
--- a/collections/vector/vector.c
+++ b/collections/vector/vector.c
@@ -63,6 +63,16 @@ vec *root;
 	return root->end;
 }
 
+int vec_capacity(root)
+vec *root;
+{
+	if (!root) {
+		return -1;
+	}
+	
+	return root->limit;
+}
+
 void vec_resize(root)
 vec *root;
 {
diff --git a/collections/vector/vector.h b/collections/vector/vector.h
index 5ab3dc3..4bcb620 100644
--- a/collections/vector/vector.h
+++ b/collections/vector/vector.h
@@ -9,6 +9,7 @@ vec* vec_with_capacity(int);
 
 /*management*/
 int vec_size(vec*);
+int vec_capacity(vec*);
 vec* vec_cp(vec*);
 void vec_print(vec*, char* (void*));