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std::basic_istream::tellg

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< cpp‎ | io‎ | basic istream

 
 
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std::basic_istream
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operator>>(std::basic_istream)
 
pos_type tellg();

Returns input position indicator of the current associated streambuf object.

Behaves as UnformattedInputFunction. After constructing and checking the sentry object, if fail()==true, returns pos_type(-1). Otherwise, returns rdbuf()->pubseekoff(0, std::ios_base::cur, std::ios_base::in).

Sommaire

[modifier] Paramètres

(Aucun)
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(none)
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[modifier] Retourne la valeur

current position of the get pointer on success, pos_type(-1) on failure

[modifier] Exemple

#include <iostream>
#include <string>
#include <sstream>
int main()
{
    std::string str = "Hello, world";
    std::istringstream in(str);
    std::string word;
    in >> word;
    std::cout << "After reading the word \"" << word
              << "\" tellg() returns " << in.tellg() << '\n';
}

Résultat :

After reading the word "Hello," tellg() returns 6

[modifier] Voir aussi

sets the input position indicator
(fonction membre publique) [edit]
renvoie l'indicateur de position de sortie
Original:
returns the output position indicator
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(fonction membre publique de std::basic_ostream) [edit]
définit l'indicateur de position de sortie
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sets the output position indicator
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(fonction membre publique de std::basic_ostream) [edit]