Extend logger to print iterables and structured bindings

common.h

@@ -5,6 +5,7 @@
 #ifndef UTILS_COMMON_H_
 #define UTILS_COMMON_H_
 
+#include <ostream>
 #include <utility>
 
 namespace utils {
@@ -18,6 +19,42 @@ template <typename T> struct has_size {
   static constexpr bool value = test<T>(int());
 };
 
+template <typename T> struct IsIterable {
+  template <typename U>
+  static constexpr decltype(std::begin(std::declval<U>()), bool())
+  beginTest(int) {
+    return true;
+  }
+  template <typename U> static constexpr bool beginTest(...) { return false; }
+  template <typename U>
+  static constexpr decltype(std::end(std::declval<U>()), bool()) endTest(int) {
+    return true;
+  }
+  template <typename U> static constexpr bool endTest(...) { return false; }
+  static constexpr bool Value = beginTest<T>(int()) && endTest<T>(int());
+};
+
+template <typename T> struct CanOutput {
+  template <typename U>
+  static constexpr decltype(operator<<(std::declval<std::ostream>(),
+                                       std::declval<U>()),
+                            bool())
+  test(int) {
+    return true;
+  }
+  template <typename U> static constexpr bool test(...) { return false; }
+  static constexpr bool Value = test<T>(int());
+};
+
+template <typename T> struct IsGettable {
+  template <typename U>
+  static constexpr decltype(std::tuple_size<U>::value, bool()) test(int) {
+    return true;
+  }
+  template <typename U> static constexpr bool test(...) { return false; }
+  static constexpr bool Value = test<T>(int());
+};
+
 } // namespace utils
 
 #endif // UTILS_COMMON_H_

logger.h

@@ -5,6 +5,7 @@
 #ifndef UTILS_LOGGER_H_
 #define UTILS_LOGGER_H_
 
+#include "utils/common.h"
 #include "utils/stringutils.h"
 #include "utils/timeutils.h"
 
@@ -17,7 +18,7 @@
 #include <iostream>
 #include <sstream>
 #include <string>
-#include <vector>
+#include <tuple>
 
 #ifndef LOG_LEVEL
 #ifdef NDEBUG
@@ -94,6 +95,18 @@ class Logger {
   /**
    * Pointer to all information about the message
    */
+
+  template <typename T, std::size_t Idx>
+  static void printTuple(Logger &logger, const T &data) {
+    if constexpr (Idx < std::tuple_size_v<T>) {
+      if constexpr (Idx > 0) {
+        logger << ", ";
+      }
+      logger << std::get<Idx>(data);
+      printTuple<T, Idx + 1>(logger, data);
+    }
+  }
+
 public:
   static void setRank(int rank) { Logger::rank = rank; }
   static void setLogAll(bool logAll) { Logger::logAll = logAll; }
@@ -228,9 +241,32 @@ class Logger {
   /**
    * Default function to add messages
    */
-  template <typename T> Logger &operator<<(T t) {
-    stream->buffer << t;
-    return maybeSpace();
+  template <typename T> Logger &operator<<(const T &data) {
+    if constexpr (CanOutput<T>::Value) {
+      stream->buffer << data;
+      return maybeSpace();
+    } else if constexpr (IsIterable<T>::Value) {
+      nospace() << '[';
+      auto it = std::begin(data);
+      if (it != std::end(data)) {
+        *this << *it;
+        ++it;
+      }
+      for (; it != std::end(data); ++it) {
+        *this << ", " << *it;
+      }
+      *this << ']';
+
+      return space();
+    } else if constexpr (IsGettable<T>::Value) {
+      nospace() << '{';
+      printTuple(*this, data);
+      *this << '}';
+
+      return space();
+    } else {
+      static_assert(false, "Output for the given type not implemented.");
+    }
   }
 
   /**
@@ -309,24 +345,6 @@ class NoLogger {
   NoLogger &operator<<(Logger &(*func)(Logger &)) { return *this; }
 };
 
-/**
- * Add a std::vector<T> to the message
- *
- * @relates utils::Logger
- */
-template <typename T>
-inline Logger &operator<<(Logger debug, const std::vector<T> &list) {
-  debug.nospace() << '(';
-  for (size_t i = 0; i < list.size(); i++) {
-    if (i)
-      debug << ", ";
-    debug << list[i];
-  }
-  debug << ')';
-
-  return debug.space();
-}
-
 } // namespace utils
 
 // Define global functions