sizeof... operator - cppreference.com
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      sizeof... operator

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      <metanoindex/>

       
      C++
       
      Linguagem C++
      Tópicos gerais
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      General topics
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      Controle de fluxo
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      Flow control
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      Declarações execução condicional
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      Conditional execution statements
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      Instruções de iteração
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      Iteration statements
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      Ir declarações
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      Jump statements
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      Funções
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      Functions
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      declaração da função
      lambda declaração da função
      modelo de função
      linha especificador
      especificações de exceção (obsoleta)
      noexcept especificador (C++11)
      Exceções
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      Exceptions
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      Namespaces
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      Namespaces
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      Tipos
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      Types
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      decltype specifier (C++11)
      Especificadores
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      Specifiers
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      cv especificadores
      armazenamento duração especificadores
      constexpr especificador (C++11)
      auto especificador (C++11)
      alignas especificador (C++11)
      Inicialização
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      Initialization
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      Literais
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      Literals
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      Expressões
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      Expressions
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      representações alternativas
      Utilitários
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      Utilities
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      Tipos
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      Types
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      typedef declaration
      tipo de alias declaração (C++11)
      atributos (C++11)
      Conversões
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      conversões implícitas
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      Elenco C-estilo e funcional
      Alocação de memória
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      Memory allocation
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      Classes
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      Classes
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      Classe propriedades específicas de função
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      Class-specific function properties
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      Funções membro especiais
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      Special member functions
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      Modelos
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      modelo de classe
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      Diversos
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      Miscellaneous
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      Assembly embutido
       
      Consulta o número de elementos de um bloco de parâmetros.
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      Queries the number of elements in a bloco de parâmetros.
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      Sintaxe

      Retorna um objeto do tipo std::size_t.
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      Returns an object of type std::size_t.
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      Explicação

      Retorna o número de elementos de um bloco de parâmetros.
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      Returns the number of elements in a bloco de parâmetros.
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      Palavras-chave

      sizeof

      Exemplo

      #include <iostream>

template<class... Args>
std::size_t f()
{
    return sizeof...(Args);
}

int main()
{
    std::cout << f<>() << '\n'
              << f<int>() << '\n'
              << f<char, int, double>() << '\n';
}

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