Add functions to check NaN values in data span (#178)

Author: ibhati

include/svs/lib/misc.h

@@ -443,4 +443,20 @@ template <std::integral T> constexpr T bitmask(T lo, T hi) {
 
 using DefaultPredicate = std::function<bool()>;
 
+///
+/// Returns true if at least one element of the span is NaN.
+///
+template <typename T, size_t N>
+bool contains_nan(std::span<const T, N> data) {
+    return std::any_of(data.begin(), data.end(), [](T v) { return std::isnan(v); });
+}
+
+///
+/// Returns true if all elements of the span are NaN.
+///
+template <typename T, size_t N>
+bool all_nan(std::span<const T, N> data) {
+    return std::all_of(data.begin(), data.end(), [](T v) { return std::isnan(v); });
+}
+
 } // namespace svs::lib