std::unordered_map::reserve - cppreference.com
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      std::unordered_map::reserve

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      C++
       
      Recipientes biblioteca
       
      std::unordered_map
      Funções de membro
      Original:
      Member functions
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      unordered_map::unordered_map
      unordered_map::~unordered_map
      unordered_map::operator=
      unordered_map::get_allocator
      Iteradores
      Original:
      Iterators
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      unordered_map::begin
      unordered_map::cbegin
      unordered_map::end
      unordered_map::cend
      Capacidade
      Original:
      Capacity
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      unordered_map::erase
      unordered_map::size
      unordered_map::max_size
      Modificadores
      Original:
      Modifiers
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      unordered_map::clear
      unordered_map::insert
      unordered_map::emplace
      unordered_map::emplace_hint
      unordered_map::erase
      unordered_map::swap
      Pesquisa
      Original:
      Lookup
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      unordered_map::count
      unordered_map::find
      unordered_map::equal_range
      Interface de balde
      Original:
      Bucket interface
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      unordered_map::begin2
      unordered_map::end2
      unordered_map::bucket_count
      unordered_map::max_bucket_count
      unordered_map::bucket_size
      unordered_map::bucket
      Política de hash
      Original:
      Hash policy
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      unordered_map::load_factor
      unordered_map::max_load_factor
      unordered_map::rehash
      unordered_map::reserve
      Observadores
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      Observers
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      unordered_map::hash_function
      unordered_map::key_eq
       
      <tbody> </tbody>
      void reserve( size_type count );
      		 (desde C++11)
      Define o número de baldes para o número necessário para acomodar, pelo menos, elementos count sem exceder fator de carga máxima e rehashes o recipiente, ou seja, coloca os elementos em baldes apropriados, considerando que o número total de baldes mudou. Efetivamente chama rehash(std::ceil(count / max_load_factor())).
      Original:
      Sets the number of buckets to the number needed to accomodate at least count elements without exceeding maximum load factor and rehashes the container, i.e. puts the elements into appropriate buckets considering that total number of buckets has changed. Effectively calls rehash(std::ceil(count / max_load_factor())).
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      Parâmetros

      count -
      nova capacidade do recipiente
      Original:
      new capacity of the container
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      Valor de retorno

      (Nenhum)
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      (none)
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      Complexidade

      caso médio linear no tamanho do recipiente quadrática pior caso,.
      Original:
      average case linear in the size of the container, worst case quadratic.
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