Codechange: replace x.size() == 0 with x.empty()

src/core/kdtree.hpp

@@ -53,7 +53,7 @@ class Kdtree {
 	/** Create one new node in the tree, return its index in the pool */
 	size_t AddNode(const T &element)
 	{
-		if (this->free_list.size() == 0) {
+		if (this->free_list.empty()) {
 			this->nodes.emplace_back(element);
 			return this->nodes.size() - 1;
 		} else {

src/core/pool_func.cpp

@@ -20,7 +20,7 @@
 {
 	PoolVector *pools = PoolBase::GetPools();
 	pools->erase(std::find(pools->begin(), pools->end(), this));
-	if (pools->size() == 0) delete pools;
+	if (pools->empty()) delete pools;
 }
 
 /**

src/core/span_type.hpp

@@ -84,7 +84,7 @@ public:
 
 	constexpr size_t size() const noexcept { return static_cast<size_t>( last - first ); }
 	constexpr std::ptrdiff_t ssize() const noexcept { return static_cast<std::ptrdiff_t>( last - first ); }
-	constexpr bool empty() const noexcept { return size() == 0; }
+	constexpr bool empty() const noexcept { return this->size() == 0; }
 
 	constexpr iterator begin() const noexcept { return iterator(first); }
 	constexpr iterator end() const noexcept { return iterator(last); }