Espaços nominais
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std::operator<<,>>

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< cpp‎ | string‎ | basic string

 
 
Biblioteca cordas
Strings terminadas
Original:
Null-terminated strings
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Cadeias de bytes
Multibyte cordas
Cordas de largura
Classes
Original:
Classes
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basic_string
char_traits
 
std::basic_string
Funções de membro
Original:
Member functions
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basic_string::basic_string
basic_string::operator=
basic_string::assign
basic_string::get_allocator
acesso. Elemento
Original:
Element access
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basic_string::at
basic_string::operator[]
basic_string::front(C++11)
basic_string::back(C++11)
basic_string::data
basic_string::c_str
Iteradores
Original:
Iterators
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basic_string::begin
basic_string::cbegin

(C++11)
basic_string::end
basic_string::cend

(C++11)
basic_string::rbegin
basic_string::crbegin

(C++11)
basic_string::rend
basic_string::crend

(C++11)
Capacidade
Original:
Capacity
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basic_string::empty
basic_string::size
basic_string::length
basic_string::max_size
basic_string::reserve
basic_string::capacity
basic_string::shrink_to_fit(C++11)
Operações
Original:
Operations
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basic_string::clear
basic_string::insert
basic_string::erase
basic_string::push_back
basic_string::pop_back(C++11)
basic_string::append
basic_string::operator+=
basic_string::compare
basic_string::replace
basic_string::substr
basic_string::copy
basic_string::resize
basic_string::swap
Pesquisar
Original:
Search
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basic_string::find
basic_string::rfind
basic_string::find_first_of
basic_string::find_first_not_of
basic_string::find_last_of
basic_string::find_last_not_of
Constantes
Original:
Constants
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basic_string::npos
Não-membros funções
Original:
Non-member functions
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operator+
operator==
operator!=
operator<
operator>
operator<=
operator>=
swap(std::basic_string)
operator<<
operator>>
getline
stoi
stol
stoll
(C++11)
(C++11)
(C++11)
stoul
stoull
(C++11)
(C++11)
stof
stod
stold
(C++11)
(C++11)
(C++11)
to_string(C++11)
to_wstring(C++11)
Classes auxiliares
Original:
Helper classes
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hash<std::string>
hash<std::wstring>
hash<std::u32string>
hash<std::u16string>
(C++11)
 
Defined in header <string>
template <class CharT, class Traits, class Allocator>

std::basic_ostream<CharT, Traits>&
    operator<<(std::basic_ostream<CharT, Traits>& os,

               const std::basic_string<CharT, Traits, Allocator>& str);
(1)
template <class CharT, class Traits, class Allocator>

std::basic_istream<CharT, Traits>&
    operator>>(std::basic_istream<CharT, Traits>& is,

               std::basic_string<CharT, Traits, Allocator>& str);
(2)
1)
Primeiro, constrói um objeto std::basic_ostream::sentry, que libera o empate () 'd fluxo, se necessário, e verifica se há erros. Se o objeto sentinela retorna false, sai imediatamente.
Original:
First, constructs a std::basic_ostream::sentry object, which flushes the tie()'d stream if necessary and checks for errors. If the sentry object returns false, exits immediately.
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Depois disso, se o objecto de sentinela true retornos, determina o formato de saída de acolchoamento da mesma maneira como o estágio 3 de num_put::put().
Original:
Afterwards, if the sentry object returns true, determines the output format padding in the same manner as stage 3 of num_put::put().
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Em seguida, armazena cada personagem da seqüência resultante (o conteúdo de str mais estofo) para o fluxo de saída os como se chamando os.rdbuf()->sputn(seq, n), onde n=std::max(os.width(), str.size())
Original:
Then stores each character from the resulting sequence (the contents of str plus padding) to the output stream os as if by calling os.rdbuf()->sputn(seq, n), where n=std::max(os.width(), str.size())
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Finalmente, chama os.width(0).
Original:
Finally, calls os.width(0).
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2)
Primeiro, constrói um objeto std::basic_istream::sentry, que libera o empate () 'd fluxo, se necessário, extratos e descarta todos os personagens principais espaços em branco, a menos que a bandeira ios_base::skipws foi cancelado, e verifica se há erros. Se o objeto sentinela retorna false, sai imediatamente.
Original:
First, constructs a std::basic_istream::sentry object, which flushes the tie()'d stream if necessary, extracts and discards all leading whitespace characters unless the ios_base::skipws flag was cleared, and checks for errors. If the sentry object returns false, exits immediately.
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Depois, se os retornos de sentinela objeto true, limpa str com str.erase()
Original:
Afterwards, if the sentry object returns true, clears str with str.erase()
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Em seguida, lê caracteres de is e acrescenta-lhes a str como se por str.append(1, c), até que uma das seguintes condições torna-se verdade:
Original:
Then reads characters from is and appends them to str as if by str.append(1, c), until one of the following conditions becomes true:
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  • N caracteres são lidos, onde N é is.width() se is.width() > 0, caso contrário, é N str.max_size()
    Original:
    N characters are read, where N is is.width() if is.width() > 0, otherwise N is str.max_size()
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  • a condição de fim de arquivo ocorre no is fluxo
    Original:
    the end-of-file condition occurs in the stream is
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  • std::isspace(c,is.getloc()) é verdade para o próximo caractere c em is (este personagem espaços em branco permanece no fluxo de entrada).
    Original:
    std::isspace(c,is.getloc()) is true for the next character c in is (this whitespace character remains in the input stream).
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Se nenhum dos caracteres são extraídos então std::ios::failbit é definido em is, que pode lançar std::ios_base::failure.
Original:
If no characters are extracted then std::ios::failbit is set on is, which may throw std::ios_base::failure.
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Finalmente, chama os.width(0) e destrói o objeto std::basic_istream::sentry.
Original:
Finally, calls os.width(0) and destroys the std::basic_istream::sentry object.
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Índice

[editar] Exceções

1)
pode lançar std::ios_base::failure se uma exceção é lançada durante a saída.
Original:
may throw std::ios_base::failure if an exception is thrown during output.
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2)
pode lançar std::ios_base::failure se não são personagens extraídos de is (por exemplo, o fluxo está no final do arquivo, ou seja constituído por espaços em branco apenas), ou se uma exceção é lançada durante a entrada.
Original:
may throw std::ios_base::failure if no characters are extracted from is (e.g the stream is at end of file, or consists of whitespace only), or if an exception is thrown during input.
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[editar] Parâmetros

os -
um fluxo de saída de caractere
Original:
a character output stream
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is -
um fluxo de entrada de caracteres
Original:
a character input stream
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str -
a string a ser inserido ou extraído
Original:
the string to be inserted or extracted
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[editar] Valor de retorno

1) os

2) is

[editar] Exemplo

#include <iostream>
#include <string>
 
int main()
{
    std::string greeting = "Hello, whirled!"
    std::cout << greeting << '\n';
}

Output:

Hello, whirled!