HashTable: Added C++11 initializer_list constructor

e.g.
    HashTable<label, string> table1
    {
        {"kjhk", 10},
        {"kjhk2", 12}
    };

    HashTable<label, label, Hash<label>> table2
    {
        {3, 10},
        {5, 12},
        {7, 16}
    };

applications/test/HashTable/Test-hashTable.C

@@ -2,7 +2,7 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           | Copyright (C) 2011 OpenFOAM Foundation
+    \\  /    A nd           | Copyright (C) 2011-2016 OpenFOAM Foundation
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
 License
@@ -30,40 +30,37 @@ License
 
 using namespace Foam;
 
-// use define so we can easily test other implementations
-#define HASHTABLE_CLASS HashTable
-
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 //  Main program:
 
 int main()
 {
-    HASHTABLE_CLASS<double> table1(13);
-    HASHTABLE_CLASS<double>::iterator iter;
-
-    table1.insert("aaa", 1.0);
-    table1.insert("aba", 2.0);
-    table1.insert("aca", 3.0);
-    table1.insert("ada", 4.0);
-    table1.insert("aeq", 5.0);
-    table1.insert("aaw", 6.0);
-    table1.insert("abs", 7.0);
-    table1.insert("acr", 8.0);
-    table1.insert("adx", 9.0);
-    table1.insert("aec", 10.0);
-
-    // erase by key
+    HashTable<scalar> table1
+    {
+        {"aaa", 1.0},
+        {"aba", 2.0},
+        {"aca", 3.0},
+        {"ada", 4.0},
+        {"aeq", 5.0},
+        {"aaw", 6.0},
+        {"abs", 7.0},
+        {"acr", 8.0},
+        {"adx", 9.0},
+        {"aec", 10.0}
+    };
+
+    // Erase by key
     table1.erase("aaw");
 
-    // erase by iterator
-    iter = table1.find("abs");
+    // Erase by iterator
+    HashTable<scalar>::iterator iter = table1.find("abs");
     table1.erase(iter);
 
     Info<< "\ntable1 toc: " << table1.toc() << endl;
     Info<< "\ntable1 sortedToc: " << table1.sortedToc() << endl;
     table1.printInfo(Info)
         << "table1 [" << table1.size() << "] " << endl;
-    forAllIter(HASHTABLE_CLASS<double>, table1, iter)
+    forAllIter(HashTable<scalar>, table1, iter)
     {
         Info<< iter.key() << " => " << iter() << nl;
     }
@@ -90,14 +87,14 @@ int main()
     {
         OStringStream os;
         os  << table1;
-        HASHTABLE_CLASS<double> readTable(IStringStream(os.str())(), 100);
+        HashTable<scalar> readTable(IStringStream(os.str())(), 100);
 
         Info<< "Istream constructor:" << readTable << endl;
     }
 
 
-    HASHTABLE_CLASS<double> table2(table1);
-    HASHTABLE_CLASS<double> table3(table1.xfer());
+    HashTable<scalar> table2(table1);
+    HashTable<scalar> table3(table1.xfer());
 
     Info<< "\ncopy table1 -> table2" << nl
         << "transfer table1 -> table3 via the xfer() method" << nl;
@@ -107,7 +104,7 @@ int main()
         << "\ntable3" << table3 << nl;
 
     Info<< "\nerase table2 by iterator" << nl;
-    forAllIter(HASHTABLE_CLASS<double>, table2, iter)
+    forAllIter(HashTable<scalar>, table2, iter)
     {
         Info<< "erasing " << iter.key() << " => " << iter() << " ... ";
         table2.erase(iter);
@@ -128,7 +125,7 @@ int main()
     table3.printInfo(Info)
         << table3 << nl;
 
-    HASHTABLE_CLASS<double> table4;
+    HashTable<scalar> table4;
 
     table4 = table3;
     Info<< "\ncopy table3 -> table4 " << table4 << nl;
@@ -145,7 +142,7 @@ int main()
     Info<< "removed an element - test table1 != table3 : "
         << (table1 != table3) << nl;
 
-    // insert a few things into table2
+    // Insert a few things into table2
     table2.set("ada", 14.0);
     table2.set("aeq", 15.0);
     table2.set("aaw", 16.0);

applications/test/HashTable2/Test-HashTable2.C

@@ -37,19 +37,21 @@ using namespace Foam;
 
 int main(int argc, char *argv[])
 {
-    HashTable<label, Foam::string> table1(0);
-
-    table1.insert("kjhk", 10);
-    table1.insert("kjhk2", 12);
+    HashTable<label, Foam::string> table1
+    {
+        {"kjhk", 10},
+        {"kjhk2", 12}
+    };
 
     Info<< "table1: " << table1 << nl
         << "toc: " << table1.toc() << endl;
 
-    HashTable<label, label, Hash<label>> table2(10);
-
-    table2.insert(3, 10);
-    table2.insert(5, 12);
-    table2.insert(7, 16);
+    HashTable<label, label, Hash<label>> table2
+    {
+        {3, 10},
+        {5, 12},
+        {7, 16}
+    };
 
     Info<< "table2: " << table2 << nl
         << "toc: " << table2.toc() << endl;

src/OpenFOAM/containers/HashTables/HashTable/HashTable.C

@@ -28,6 +28,7 @@ License
 
 #include "HashTable.H"
 #include "List.H"
+#include "Tuple2.H"
 
 // * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
@@ -54,27 +55,15 @@ Foam::HashTable<T, Key, Hash>::HashTable(const label size)
 template<class T, class Key, class Hash>
 Foam::HashTable<T, Key, Hash>::HashTable(const HashTable<T, Key, Hash>& ht)
 :
-    HashTableCore(),
-    nElmts_(0),
-    tableSize_(ht.tableSize_),
-    table_(nullptr)
+    HashTable<T, Key, Hash>(ht.tableSize_)
 {
-    if (tableSize_)
+    for (const_iterator iter = ht.cbegin(); iter != ht.cend(); ++iter)
     {
-        table_ = new hashedEntry*[tableSize_];
-
-        for (label hashIdx = 0; hashIdx < tableSize_; hashIdx++)
-        {
-            table_[hashIdx] = 0;
-        }
-
-        for (const_iterator iter = ht.cbegin(); iter != ht.cend(); ++iter)
-        {
-            insert(iter.key(), *iter);
-        }
+        insert(iter.key(), *iter);
     }
 }
 
+
 template<class T, class Key, class Hash>
 Foam::HashTable<T, Key, Hash>::HashTable
 (
@@ -90,6 +79,21 @@ Foam::HashTable<T, Key, Hash>::HashTable
 }
 
 
+template<class T, class Key, class Hash>
+Foam::HashTable<T, Key, Hash>::HashTable
+(
+    std::initializer_list<Tuple2<Key, T>> lst
+)
+:
+    HashTable<T, Key, Hash>(lst.size())
+{
+    for (const Tuple2<Key, T>& pair : lst)
+    {
+        insert(pair.first(), pair.second());
+    }
+}
+
+
 // * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //
 
 template<class T, class Key, class Hash>

src/OpenFOAM/containers/HashTables/HashTable/HashTable.H

@@ -49,6 +49,7 @@ SourceFiles
 #include "word.H"
 #include "Xfer.H"
 #include "className.H"
+#include <initializer_list>
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
@@ -62,6 +63,9 @@ template<class T> class UList;
 template<class T, class Key, class Hash> class HashTable;
 template<class T, class Key, class Hash> class HashPtrTable;
 
+template<class Type1, class Type2>
+class Tuple2;
+
 template<class T, class Key, class Hash>
 Istream& operator>>(Istream&, HashTable<T, Key, Hash>&);
 
@@ -171,6 +175,7 @@ class HashTable
         //- Assign a new hashedEntry to a possibly already existing key
         bool set(const Key&, const T& newElmt, bool protect);
 
+
 public:
 
     // Forward declaration of iterators
@@ -207,6 +212,9 @@ public:
         //- Construct by transferring the parameter contents
         HashTable(const Xfer<HashTable<T, Key, Hash>>&);
 
+        //- Construct from an initializer list
+        HashTable(std::initializer_list<Tuple2<Key, T>> lst);
+
 
     //- Destructor
     ~HashTable();