fix gcc-15 warnings

Author: foolnotion

include/operon/operators/evaluator.hpp

@@ -243,7 +243,7 @@ class MultiEvaluator : public EvaluatorBase {
         EvaluatorBase::ReturnType fit;
         fit.reserve(ind.Size());
 
-        for (auto const ev : evaluators_) {
+        for (auto const& ev: evaluators_) {
             auto f = (*ev)(rng, ind, buf);
             std::copy(f.begin(), f.end(), std::back_inserter(fit));
         }
@@ -257,7 +257,7 @@ class MultiEvaluator : public EvaluatorBase {
         auto callCnt{0UL};
         auto cfTime{0UL};
 
-        for (auto const ev : evaluators_) {
+        for (auto const& ev: evaluators_) {
             auto [re, je, cc, ct] = ev->Stats();
             resEval += re;
             jacEval += je;

source/operators/non_dominated_sorter/rank_intersect.cpp

@@ -30,6 +30,7 @@ namespace {
     template<typename T>
     auto MakeUnique(std::size_t n, std::optional<typename std::remove_extent_t<T>> init = std::nullopt)
     {
+        ENSURE(n > 0);
         using E = typename std::remove_extent_t<T>;
         auto ptr = std::make_unique<E[]>(n);
         if (init) { std::fill_n(ptr.get(), n, init.value()); }