sizeof... operator - cppreference.com

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Consulta o número de elementos de um bloco de parâmetros.

Original:

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Sintaxe


`sizeof...(` parameter_pack `)`		(desde C++11)

Retorna um objeto do tipo std::size_t.

Original:

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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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';
}

Saída:

Veja também

sizeof