Revise comments about C++14

src/base/bittorrent/session.cpp

@@ -225,7 +225,7 @@ namespace
     template <typename T>
     std::function<T (const T&)> clampValue(const T lower, const T upper)
     {
-        // TODO: change return type to `auto` when using C++14
+        // TODO: change return type to `auto` when using C++17
         return [lower, upper](const T value) -> T
         {
             if (value < lower)

src/base/indexrange.h

@@ -38,7 +38,7 @@ class IndexInterval
 public:
     using IndexType = Index;
 
-    IndexInterval(IndexType first, IndexType last)  // add constexpr when using C++14
+    IndexInterval(IndexType first, IndexType last)  // add constexpr when using C++17
         : m_first {first}
         , m_last {last}
     {

src/base/tristatebool.h

@@ -48,7 +48,7 @@ public:
         return m_value;
     }
 
-    TriStateBool &operator=(const TriStateBool &other) = default;  // add constexpr when using C++14
+    TriStateBool &operator=(const TriStateBool &other) = default;  // add constexpr when using C++17
 
     constexpr bool operator==(const TriStateBool &other) const
     {