Reduce unnecessary COW on Vector by make writing explicit

This commit makes operator[] on Vector const and adds a write proxy to it.  From
now on writes to Vectors need to happen through the .write proxy. So for
instance:

Vector<int> vec;
vec.push_back(10);
std::cout << vec[0] << std::endl;
vec.write[0] = 20;

Failing to use the .write proxy will cause a compilation error.

In addition COWable datatypes can now embed a CowData pointer to their data.
This means that String, CharString, and VMap no longer use or derive from
Vector.

_ALWAYS_INLINE_ and _FORCE_INLINE_ are now equivalent for debug and non-debug
builds. This is a lot faster for Vector in the editor and while running tests.
The reason why this difference used to exist is because force-inlined methods
used to give a bad debugging experience. After extensive testing with modern
compilers this is no longer the case.

1 files changed, 11 insertions, 11 deletions

diff --git a/core/variant.cpp b/core/variant.cpp
index c48aa57652..e4be5520bc 100644
--- a/core/variant.cpp
+++ b/core/variant.cpp
@@ -1878,7 +1878,7 @@ Variant::operator Vector<RID>() const {
 	Vector<RID> rids;
 	rids.resize(va.size());
 	for (int i = 0; i < rids.size(); i++)
-		rids[i] = va[i];
+		rids.write[i] = va[i];
 	return rids;
 }
 
@@ -1891,7 +1891,7 @@ Variant::operator Vector<Vector2>() const {
 		return Vector<Vector2>();
 	to.resize(len);
 	PoolVector<Vector2>::Read r = from.read();
-	Vector2 *w = &to[0];
+	Vector2 *w = to.ptrw();
 	for (int i = 0; i < len; i++) {
 
 		w[i] = r[i];
@@ -1945,7 +1945,7 @@ Variant::operator Vector<Plane>() const {
 	planes.resize(va_size);
 
 	for (int i = 0; i < va_size; i++)
-		planes[i] = va[i];
+		planes.write[i] = va[i];
 
 	return planes;
 }
@@ -1958,7 +1958,7 @@ Variant::operator Vector<Variant>() const {
 	to.resize(len);
 	for (int i = 0; i < len; i++) {
 
-		to[i] = from[i];
+		to.write[i] = from[i];
 	}
 	return to;
 }
@@ -1971,7 +1971,7 @@ Variant::operator Vector<uint8_t>() const {
 	to.resize(len);
 	for (int i = 0; i < len; i++) {
 
-		to[i] = from[i];
+		to.write[i] = from[i];
 	}
 	return to;
 }
@@ -1983,7 +1983,7 @@ Variant::operator Vector<int>() const {
 	to.resize(len);
 	for (int i = 0; i < len; i++) {
 
-		to[i] = from[i];
+		to.write[i] = from[i];
 	}
 	return to;
 }
@@ -1995,7 +1995,7 @@ Variant::operator Vector<real_t>() const {
 	to.resize(len);
 	for (int i = 0; i < len; i++) {
 
-		to[i] = from[i];
+		to.write[i] = from[i];
 	}
 	return to;
 }
@@ -2008,7 +2008,7 @@ Variant::operator Vector<String>() const {
 	to.resize(len);
 	for (int i = 0; i < len; i++) {
 
-		to[i] = from[i];
+		to.write[i] = from[i];
 	}
 	return to;
 }
@@ -2020,7 +2020,7 @@ Variant::operator Vector<StringName>() const {
 	to.resize(len);
 	for (int i = 0; i < len; i++) {
 
-		to[i] = from[i];
+		to.write[i] = from[i];
 	}
 	return to;
 }
@@ -2034,7 +2034,7 @@ Variant::operator Vector<Vector3>() const {
 		return Vector<Vector3>();
 	to.resize(len);
 	PoolVector<Vector3>::Read r = from.read();
-	Vector3 *w = &to[0];
+	Vector3 *w = to.ptrw();
 	for (int i = 0; i < len; i++) {
 
 		w[i] = r[i];
@@ -2050,7 +2050,7 @@ Variant::operator Vector<Color>() const {
 		return Vector<Color>();
 	to.resize(len);
 	PoolVector<Color>::Read r = from.read();
-	Color *w = &to[0];
+	Color *w = to.ptrw();
 	for (int i = 0; i < len; i++) {
 
 		w[i] = r[i];