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std::stof, std::stod, std::stold

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< cpp‎ | string‎ | basic string

 
 
Bibliothèque de chaînes de caractères
Chaînes à zéro terminal
Original:
Null-terminated strings
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Les chaînes d'octets
Chaines multi-octets
Les chaînes étendues
Classes
Original:
Classes
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basic_string
char_traits
 
std::basic_string
Les fonctions membres
Original:
Member functions
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basic_string::basic_string
basic_string::operator=
basic_string::assign
basic_string::get_allocator
Elément d'accès
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
Les itérateurs
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)
Capacité
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)
Opérations
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
Recherche
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
Tiers fonctions
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 d'aide
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>
float       stof( const std::string& str, size_t *pos = 0 );
(1) (depuis C++11)
double      stod( const std::string& str, size_t *pos = 0 );
(2) (depuis C++11)
long double stold( const std::string& str, size_t *pos = 0 );
(3) (depuis C++11)
Interpréter une valeur à virgule flottante dans un str chaîne .
Original:
Interprets a floating point value in a string str.
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Fonction supprime les caractères blancs (tel que déterminé par std::isspace()) jusqu'au premier caractère non-blanc est trouvé. Ensuite, il faut autant de caractères que possible pour former une représentation en virgule flottante valide et les convertit en valeur à virgule flottante. La valeur du point flottante valide peut être l'un des suivants:
Original:
Function discards any whitespace characters (as determined by std::isspace()) until first non-whitespace character is found. Then it takes as many characters as possible to form a valid floating point representation and converts them to floating point value. The valid floating point value can be one of the following:
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  • décimal expression en virgule flottante. Il se compose des éléments suivants:
    Original:
    decimal floating point expression. It consists of the following parts:
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  • (en option) signe plus ou moins
    Original:
    (en option) plus or minus sign
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  • séquence non vide de chiffres décimaux contenant éventuellement un point décimal (définit mantisse)
    Original:
    nonempty sequence of decimal digits optionally containing a decimal point character (defines significand)
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  • (en option) e ou E suivi avec moins optionnels ou signe plus et la séquence non vide de chiffres décimaux (définit exposant)
    Original:
    (en option) e or E followed with optional minus or plus sign and nonempty sequence of decimal digits (defines exponent)
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  • expression binaire à virgule flottante. Il se compose des éléments suivants:
    Original:
    binary floating point expression. It consists of the following parts:
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  • (en option) signe plus ou moins
    Original:
    (en option) plus or minus sign
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  • 0x or 0X
  • séquence non vide de chiffres hexadécimaux contenant éventuellement un point décimal (définit mantisse)
    Original:
    nonempty sequence of hexadecimal digits optionally containing a decimal point character (defines significand)
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  • (en option) p ou P suivi avec moins optionnels ou signe plus et la séquence non vide de chiffres hexadécimaux (définit exposant)
    Original:
    (en option) p or P followed with optional minus or plus sign and nonempty sequence of hexadecimal digits (defines exponent)
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  • l'infini expression. Il se compose des éléments suivants:
    Original:
    infinity expression. It consists of the following parts:
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  • (en option) signe plus ou moins
    Original:
    (en option) plus or minus sign
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  • INF ou INFINITY ignorant la casse
    Original:
    INF or INFINITY ignoring case
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  • un nombre non-expression. Il se compose des éléments suivants:
    Original:
    not-a-number expression. It consists of the following parts:
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  • (en option) signe plus ou moins
    Original:
    (en option) plus or minus sign
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  • NAN ou NAN(' char_sequence ) en ignorant la casse de la partie NAN. Char_sequence' ne peut contenir que des caractères alphanumériques. Le résultat est une valeur à virgule flottante NaN calme .
    Original:
    NAN or NAN(char_sequence) ignoring case of the NAN part. char_sequence can only contain alphanumeric characters. The result is a quiet NaN floating point value.
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L'indice du premier caractère non converti est stocké dans pos. Si NULL est passé comme pos, il est ignoré .
Original:
The index of the first unconverted character is stored in pos. If NULL is passed as pos, it is ignored.
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Sommaire

[modifier] Paramètres

str -
la chaîne à convertir
Original:
the string to convert
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pos -
traiter de nombre entier pour stocker l'index du premier caractère non converti
Original:
address of integer to store the index of the first unconverted character
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[modifier] Retourne la valeur

La chaîne convertie vers le type spécifié en virgule flottante .
Original:
The string converted to the specified floating point type.
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[modifier] Exceptions

std::invalid_argument si aucune conversion peut être effectuée
Original:
std::invalid_argument if no conversion could be performed
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std::out_of_range si la valeur convertie tomberait hors de la plage du type de résultat .
Original:
std::out_of_range if the converted value would fall out of the range of the result type.
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[modifier] Voir aussi

(C++11)
(C++11)
(C++11)
convertit une chaîne en un entier signé
Original:
converts a string to an signed integer
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(fonction) [edit]
(C++11)
(C++11)
convertit une chaîne en un entier non signé
Original:
converts a string to an unsigned integer
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(fonction) [edit]