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std::basic_istream<CharT,Traits>::get - cppreference.com

int_type get();

basic_istream& get( char_type& ch );

basic_istream& get( basic_streambuf& strbuf );

basic_istream& get( basic_streambuf& strbuf, char_type delim );

Extracts character or characters from stream.

All versions behave as UnformattedInputFunctions. After constructing and checking the sentry object, these functions perform the following:

Reads one character and returns it if available. Otherwise, returns

and sets

and

.

Reads one character and stores it to

if available. Otherwise, leaves

unmodified and sets

and

. Note that this function is not overloaded on the types

and

, unlike the formatted character input operator>>.

Same as

, that is, reads at most

characters and stores them into character string pointed to by

until

is found.

Reads characters and stores them into the successive locations of the character array whose first element is pointed to by

. Characters are extracted and stored until any of the following occurs:

• count is less than 1 or count - 1 characters have been stored.
• end of file condition occurs in the input sequence (setstate(eofbit) is called).
• the next available input character c equals delim, as determined by Traits::eq(c, delim). This character is not extracted (unlike getline()).

In any case, if count > 0, a null character (CharT() is stored in the next successive location of the array.

Same as

, that is, reads available characters and inserts them to the given

object until

is found.

Reads characters and inserts them to the output sequence controlled by the given

object. Characters are extracted and inserted into

until any of the following occurs:

• end of file condition occurs in the input sequence.
• inserting into the output sequence fails (in which case the character that could not be inserted, is not extracted).
• the next available input character c equals delim, as determined by Traits::eq(c, delim). This character is not extracted.
• an exception occurs (in which case the exception is caught and not rethrown).

If no characters were extracted, calls setstate(failbit).

All versions set the value of gcount() to the number of characters extracted.

1) The extracted character or Traits::eof().

2-6) *this

if an error occurred (the error state flag is not

) and

is set to throw for that state.

If an internal operation throws an exception, it is caught and badbit is set. If exceptions() is set for badbit, the exception is rethrown.

#include <iostream>
#include <sstream>
 
int main()
{
    std::istringstream s1("Hello, world.");
    char c1 = s1.get(); // reads 'H'
    std::cout << "after reading " << c1 << ", gcount() == " <<  s1.gcount() << '\n';
 
    char c2;
    s1.get(c2);         // reads 'e'
    char str[5];
    s1.get(str, 5);     // reads "llo,"
    std::cout << "after reading " << str << ", gcount() == " <<  s1.gcount() << '\n';
 
    std::cout << c1 << c2 << str;
    s1.get(*std::cout.rdbuf()); // reads the rest, not including '\n'
    std::cout << "\nAfter the last get(), gcount() == " << s1.gcount() << '\n';
}

Output:

after reading H, gcount() == 1
after reading llo,, gcount() == 4
Hello, world.
After the last get(), gcount() == 7

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

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