Espaços nominais
Variantes
Acções

<div class="t-tr-text">C + + palavras-chave:<div class="t-tr-dropdown"><div><div><div class="t-tr-dropdown-arrow-border"></div><div class="t-tr-dropdown-arrow"></div><div class="t-tr-dropdown-h">Original:</div><div class="t-tr-dropdown-orig">C++ keywords:</div><div class="t-tr-dropdown-notes">The text has been machine-translated via [http://translate.google.com Google Translate].<br/> You can help to correct and verify the translation. Click [http://en.cppreference.com/w/Cppreference:MachineTranslations here] for instructions.</div></div></div></div></div> typename

Da cppreference.com
< cpp‎ | keyword

 
 
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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Casts
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conversões implícitas
const_cast conversion
static_cast conversion
dynamic_cast conversion
reinterpret_cast conversion
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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Templates
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modelo de classe
modelo de função
especialização de modelo
pacotes de parâmetros (C++11)
Diversos
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Miscellaneous
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Assembly embutido
 
 

[editar] Uso

  • Numa modelo de classe ou modelo de função, typename pode ser usado como uma alternativa para classe declarar tipos templated.
    Original:
    In a modelo de classe or modelo de função, typename can be used as an alternative to classe to declare templated types.
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  • Dentro de uma definição de modelo, typename pode ser usado para declarar que um nome dependente é um tipo.
    Original:
    Inside a template definition, typename can be used to declare that a dependent name is a type.
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[editar] Exemplo

template <typename T>
void foo (const std::vector<T> &v)
{
    // std::vector<T>::const_iterator is a dependent name,
    // so using it as a type requires the addition of the
    // typename keyword
    typename std::vector<T>::const_iterator it = v.begin();
}