std::is_bind_expression
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Déclaré dans l'en-tête <functional> | ||
template<class T > struct is_bind_expression; | (depuis C++11) | |
Si
T est le type généré par un appel à std::bind, ce modèle fournit un membre de valeur value constante égale à true. Pour tout autre type, value est false .Original:
If
T is the type produced by a call to std::bind, this template provides the member constant value equal true. For any other type, value is false.The text has been machine-translated via Google Translate.
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Ce modèle peut être spécialisé pour un type défini par l'utilisateur qui doit être traitée par std::bind comme si elle était le type d'une sous-expression bind: si un objet fonction bind généré est invoquée, un argument lié de ce type sera appelée comme une fonction objet et sera donné tous les arguments non liés passées à l'objet bind généré .
Original:
This template may be specialized for a user-defined type which should be treated by std::bind as if it was the type of a bind subexpression: when a bind-generated function object is invoked, a bound argument of this type will be invoked as a function object and will be given all the unbound arguments passed to the bind-generated object.
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Sommaire |
Inherited from std::integral_constant
Member constants
value [ statique ]Original: static The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. | true si T is a function object generated by std::bind, false autrement Original: The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (constante membre statique publique) |
Member functions
operator bool | convertit l'objet en bool, retourne valueOriginal: converts the object to bool, returns valueThe text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (fonction membre publique) |
Member types
Type d' Original: Type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. | Definition |
value_type | bool |
type | std::integral_constant<bool, value> |
[modifier]Exemple
#include <iostream>#include <type_traits>#include <functional> struct MyBind {typedefint result_type;int operator()(int a, int b)const{return a + b;}}; namespace std {template<>struct is_bind_expression<MyBind>:public true_type {};} int f(int n1, int n2){return n1+n2;} int main(){// as if bind(f, bind(MyBind::operator(), _1, _2), 2)auto b =std::bind(f, MyBind(), 2); std::cout<<"Adding 2 to the sum of 10 and 11 gives "<< b(10, 11)<<'\n';}
Résultat :
Adding 2 to the sum of 10 and 11 gives 23
[modifier]Voir aussi
(C++11) | liaison de paramètres et application partielle d'un foncteur (fonction générique) |
