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std::basic_istream::peek(3) C++ Standard Libary std::basic_istream::peek(3) NAME std::basic_istream::peek - std::basic_istream::peek Synopsis int_type peek(); Behaves as UnformattedInputFunction. After constructing and testing the sentry object, reads the next character from the input stream without ex- tracting it. Parameters (none) Return value If good() == true, returns the next character as obtained by rd- buf()->sgetc() Otherwise, returns Traits::eof(). Exceptions failure if an error occurred (the error state flag is not goodbit) and exceptions() is set to throw for that state. If an internal operation throws an exception, it is caught and bad- bit is set. If exceptions() is set for badbit, the exception is rethrown. Example // Run this code #include <sstream> #include <iostream> int main() { std::istringstream s1("Hello, world."); char c1 = s1.peek(); char c2 = s1.get(); std::cout << "Peeked: " << c1 << " got: " << c2 << '\n'; } Output: Peeked: H got: H See also sgetc reads one character from the input sequence without advancing the sequence (public member function of std::basic_streambuf<CharT,Traits>) get extracts characters (public member function) unget unextracts a character (public member function) http://cppreference.com 2022.07.31 std::basic_istream::peek(3)
NAME | Synopsis | Parameters | Return value | Exceptions | Example | Output: | See also
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