std::function::operator bool - cppreference.com
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Verifica se *this armazena um alvo função exigível, ou seja, não está vazia.
Original:
Checks whether *this stores a callable function target, i.e. is not empty.
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Parâmetros
(Nenhum)
Original:
(none)
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Valor de retorno
true se *this armazena uma função alvo pode ser chamado, caso contrário false.
Original:
true if *this stores a callable function target, false otherwise.
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You can help to correct and verify the translation. Click here for instructions.