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std::map::size

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< cpp‎ | container‎ | map

 
 
 
std::map
Member-Funktionen
Original:
Member functions
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map::map
map::~map
map::operator=
map::get_allocator
Elementzugriff zerstört
Original:
Element access
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map::at
map::operator[]
Iteratoren
Original:
Iterators
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map::begin
map::cbegin

(C++11)
map::end
map::cend

(C++11)
map::rbegin
map::crbegin

(C++11)
map::rend
map::crend

(C++11)
Kapazität
Original:
Capacity
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map::empty
map::size
map::max_size
Modifiers
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Modifiers
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map::clear
map::insert
map::emplace(C++11)
map::emplace_hint(C++11)
map::erase
map::swap
Lookup
Original:
Lookup
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map::count
map::find
map::equal_range
map::lower_bound
map::upper_bound
Beobachter
Original:
Observers
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map::key_comp
map::value_comp
 
size_type size() const;

Returns the number of elements in the container, i.e. std::distance(begin(), end()).

Inhaltsverzeichnis

[Bearbeiten] Parameter

(None)
Original:
(none)
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[Bearbeiten] Rückgabewert

die Anzahl der Elemente in dem Behälter
Original:
the number of elements in the container
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[Bearbeiten] Ausnahmen

noexcept specification:  
noexcept
  (seit C++11)

[Bearbeiten] Komplexität

Constant

[Bearbeiten] Beispiel

The following code uses size to display the number of elements in a std::map<int>:

#include <map>
#include <iostream>
 
int main()
{
    std::map<int, char> nums {{1, 'a'}, {3, 'b'}, {5, 'c'}, {7, 'd'}};
 
    std::cout << "nums contains " << nums.size() << " elements.\n";
}

Output:

nums contains 4 elements.

[Bearbeiten] Siehe auch

prüft, ob der Container leer ist
Original:
checks whether the container is empty
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(öffentliche Elementfunktion) [edit]
gibt die maximal mögliche Anzahl von Elementen
Original:
returns the maximum possible number of elements
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(öffentliche Elementfunktion) [edit]