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, 6 insertions, 6 deletions

diff --git a/core/compressed_translation.cpp b/core/compressed_translation.cpp
index 266d793af7..5c1fd26e2a 100644
--- a/core/compressed_translation.cpp
+++ b/core/compressed_translation.cpp
@@ -73,7 +73,7 @@ void PHashTranslation::generate(const Ref<Translation> &p_from) {
 		Pair<int, CharString> p;
 		p.first = idx;
 		p.second = cs;
-		buckets[h % size].push_back(p);
+		buckets.write[h % size].push_back(p);
 
 		//compress string
 		CharString src_s = p_from->get_message(E->get()).operator String().utf8();
@@ -100,7 +100,7 @@ void PHashTranslation::generate(const Ref<Translation> &p_from) {
 			ps.compressed[0] = 0;
 		}
 
-		compressed[idx] = ps;
+		compressed.write[idx] = ps;
 		total_compression_size += ps.compressed.size();
 		total_string_size += src_s.size();
 		idx++;
@@ -111,8 +111,8 @@ void PHashTranslation::generate(const Ref<Translation> &p_from) {
 
 	for (int i = 0; i < size; i++) {
 
-		Vector<Pair<int, CharString> > &b = buckets[i];
-		Map<uint32_t, int> &t = table[i];
+		const Vector<Pair<int, CharString> > &b = buckets[i];
+		Map<uint32_t, int> &t = table.write[i];
 
 		if (b.size() == 0)
 			continue;
@@ -136,7 +136,7 @@ void PHashTranslation::generate(const Ref<Translation> &p_from) {
 			}
 		}
 
-		hfunc_table[i] = d;
+		hfunc_table.write[i] = d;
 		bucket_table_size += 2 + b.size() * 4;
 	}
 
@@ -157,7 +157,7 @@ void PHashTranslation::generate(const Ref<Translation> &p_from) {
 
 	for (int i = 0; i < size; i++) {
 
-		Map<uint32_t, int> &t = table[i];
+		const Map<uint32_t, int> &t = table[i];
 		if (t.size() == 0) {
 			htw[i] = 0xFFFFFFFF; //nothing
 			continue;