- Fixed some missing and erroneous testing logic for containers

- Lots of bug-fixing for containers
 - Performance optimization for containers

examples/assert.cpp

@@ -0,0 +1,67 @@
+// =====================================================================================================================
+//  I release this example code into the public domain
+// =====================================================================================================================
+
+// This file contains code that tests the efficiency of the assert macro scheme in
+// fennec engine. This is purely looking at the branching aspect and not the private
+// assert definition. The code only uses passing values to see any performance overhead
+// from the conditional
+
+// This code is based on the example code that cppreference provides at
+// https://en.cppreference.com/w/cpp/language/attributes/likely
+
+// To my surprise, the difference between them is negligible.
+// Even when n is a crazy number like one billion, there isn't a conclusive difference.
+// I checked that it isn't the lambdas, they are optimized out.
+
+// In debug mode, the results are to be expected; release < experimental < control
+
+#include <cassert>
+#include <chrono>
+#include <cstddef>
+#include <iomanip>
+#include <iostream>
+
+#define assert_c(expression) \
+if(not(expression)) { \
+std::abort(); \
+}
+
+#define assert_e(expression) \
+if(not(expression)) [[unlikely]] { \
+std::abort(); \
+}
+
+#define assert_r(expression) (static_cast<void> (0))
+
+volatile int sink{}; // ensures a side effect
+
+int main() {
+	auto benchmark = [](auto fun, auto rem) {
+		srand(0);
+
+		const auto start = std::chrono::high_resolution_clock::now();
+		for (auto size{1ULL}; size != 10'000'000ULL; ++size)
+			sink = fun(rand());
+		const std::chrono::duration<double> diff =
+			std::chrono::high_resolution_clock::now() - start;
+
+		std::cout << "Time: " << std::fixed << std::setprecision(6) << diff.count()
+				  << " sec " << rem << std::endl;
+	};
+
+	benchmark([](int x) {
+		assert_c(0 <= x && x <= RAND_MAX);
+		return x;
+	}, "control");
+
+	benchmark([](int x) {
+		assert_r(0 <= x && x <= RAND_MAX);
+		return x;
+	}, "release");
+
+	benchmark([](int x) {
+		assert_e(0 <= x && x <= RAND_MAX);
+		return x;
+	}, "experimental");
+}