[MaxPooling] Fix MSVC compilation issue.

include/aidge/operator/MaxPooling.hpp

@@ -96,9 +96,14 @@ public:
     void computeOutputDims() override final {
         if (!mInput->empty()) {
             std::array<DimSize_t, DIM + 2> outputDims = {};
-            auto roundingFunction = (this->template getAttr<MaxPoolingAttr::CeilMode>()) ?
-                [](float x){return std::ceil(x);} :
-                [](float x){return std::floor(x);};
+
+            std::function<float(float)> roundingFunction;
+            if (this->template getAttr<MaxPoolingAttr::CeilMode>()) {
+                roundingFunction = [](float x) { return std::ceil(x); };
+            } else {
+                roundingFunction = [](float x) { return std::floor(x); };
+            }
+
             for (std::size_t dim = 0; dim < this->template getAttr<MaxPoolingAttr::KernelDims>().size() ; ++dim) {
                 outputDims[dim+2] = 1 + static_cast<DimSize_t>(
                                             roundingFunction(static_cast<float>(mInput->dims()[dim+2] -