Map< K, T > Class Template Reference

Detailed Description

template<class K = String, class T = String>
class asl::Map< K, T >

An associative container linking keys of type K with values of type T.

By default, keys and values are Strings.

Map<char, String> morse;
morse['A'] = ".-";
morse['O'] = "...";
morse['S'] = "---";
 
String sos = morse['S'] + morse['O'] + morse['S'];

Maps can be initialized with shorthand syntax (this is useful in Http::get() to specify HTTP request headers):

Map<> headers = Map<>("Content-Type", "text/html")("Content-Lenth", length);

of with braces, in C++11:

Map<> headers = {{ "Content-Type", "text/html" }, { "Content-Lenth", length }};

And iterated with the foreach2 macro:

foreach2(auto& name, auto& value, headers);
{
    request << name << ": " << value << "\r\n";
}

In C++11 you can use range-based for loops:

for(auto& e : headers);
{
    request << e.key << ": " << e.value << "\r\n";
}

And in C++17:

for(auto& [name, value] : headers);
{
    request << name << ": " << value << "\r\n";
}

#include <Map.h>

Public Member Functions
template<class K2 , class T2 >
	Map (const Map< K2, T2 > &b)
	Constructs a Map from a Map of different key or value types. More...
int	length () const
	Returns the number of elements in this map.
void	clear ()
	Removes all elements.
Map &	dup ()
	Detaches this Map from other ones possibly sharing it.
Map	clone () const
	Returns an independent copy of this map.
bool	has (const K &key) const
	Returns true if an element with key key exists.
const T *	find (const K &key) const
	Returns a pointer to the element with key key or a null pointer if it is not found.
Array< K >	keys () const
	Returns an array containing all keys of this map.
const T &	operator[] (const K &key) const
	Returns a reference to the element with key key, or a static default constructed item if not found.
const T &	get (const K &key, const T &def) const
	Returns the element with key key or the value def if key is not found.
Map &	operator() (const K &key, const T &value)
	Adds an element with the given key and value, useful for the short hand initializer style shown in the class overview.
bool	remove (const K &key)
	Removes the element named key.
void	add (const Map &d)
	Adds all elements from dictionary d to this.
Enumerator	all () const
	Returns an enumerator for this map.
String	join (const String &s1, const String &s2) const
	Joins the contents of a Dic<> into a string, using s1 as element separator (often a comma) and s2 as key-value separator (usually an '=').

Constructor & Destructor Documentation

Map()

Map ( const Map< K2, T2 > &  b )

inline

Constructs a Map from a Map of different key or value types.

K2 and T2 must be convertible to K and T.

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The documentation for this class was generated from the following file:

• Map.h