Listing B

// Easily -> 3, collections -> 12, write -> 5

 std::cout << coll_container( collWords);


 // Easily -> 3

 // collections -> 12

 // write -> 5

 std::cout << coll_container( collWords,

    formatter( coll_transform( "%k -> %v"), "\n"));


 // [Easily] -> [3];

 // [collections] -> [12];

 // [write] -> [5].

 std::cout << coll_container( collWords,

    formatter( coll_transform( "[%k] -> [%v]"), "", ";\n", "."));


 // Key: Easily, Value: 3;

 // Key: collections, Value: 12;

 // Key: write, Value: 5.

 std::cout << coll_container( collWords,

    formatter( coll_transform( "Key: %k, Value: %v"), "", ";\n", "."));


 // Word 'Easily' appeared 3 time(s).

 // Word 'collections' appeared 12 time(s).

 // Word 'write' appeared 5 time(s).

 std::cout << coll_container( collWords,

    formatter( coll_transform( "Word '%k' appeared %v time(s)."), "\n"));


 // (note that after each element, we write ';'

 // but after the last element, we write '.')

 //

 // Word 'Easily' appeared 3 time(s);

 // Word 'collections' appeared 12 time(s);

 // Word 'write' appeared 5 time(s).

 std::cout << coll_container( collWords,

    formatter( coll_transform( "Word '%k' appeared %v time(s)"),

    "", ";\n", "."));


 // Word 'EASILY' appeared 3 time(s);

 // Word 'COLLECTIONS' appeared 12 time(s);

 // Word 'WRITE' appeared 5 time(s).

 std::cout << coll_container( collWords,

    formatter( coll_transform( "Word '%k' appeared %v time(s)", KeyToUpper()),

    "", ";\n", "."));

 

// [0] Word 'Easily' appeared 3 time(s);

// [1] Word 'collections' appeared 12 time(s);

// [2] Word 'write' appeared 5 time(s).

std::cout << coll_container( collWords,

    formatter( coll_transform( "Word '%k' appeared %v time(s)", PrefixByIndex()),