adjust values api to vector-esque interface

Signed-off-by: Folling <mail@folling.io>

src/values/value_base.hpp

@@ -0,0 +1,35 @@
+#pragma once
+
+template<typename V>
+typename V::data_type const * ikarus_value_base_get(V * value, size_t idx) {
+    if (value->is_indeterminate()) {
+        return nullptr;
+    }
+
+    return &value->value[idx];
+}
+
+template<typename V>
+size_t ikarus_value_base_get_size(V const * value) {
+    return value->value.size();
+}
+
+template<typename V>
+void ikarus_value_base_set(V * value, size_t idx, typename V::data_type new_data) {
+    value->value[idx] = new_data;
+}
+
+template<typename V>
+void ikarus_value_base_remove(V * value, size_t idx) {
+    value->value.erase(value->value.begin() + idx);
+}
+
+template<typename V>
+void ikarus_value_base_insert(V * value, size_t idx, typename V::data_type new_data) {
+    value->value.insert(value->value.begin() + idx, new_data);
+}
+
+template<typename V>
+struct IkarusValue * ikarus_value_base_to_value(V * value) {
+    return static_cast<IkarusValue *>(value);
+}