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Showing content from https://en.cppreference.com/w/cpp/language/../algorithm/../ranges/../../cpp/io/manip/skipws.html below:

std::skipws, std::noskipws - cppreference.com

Enables or disables skipping of leading whitespace by the formatted input functions (enabled by default). Has no effect on output.

The whitespace skipping is performed by the constructor of std::basic_istream::sentry, which reads and discards the characters classified as whitespace by the std::ctype facet of the stream's imbued locale.

This is an I/O manipulator, it may be called with an expression such as out << std::noskipws for any out of type std::basic_ostream or with an expression such as in >> std::noskipws for any in of type std::basic_istream.

str (reference to the stream after manipulation).

#include <iostream>
#include <sstream>
 
int main()
{
    char c1, c2, c3;
    std::istringstream("a b c") >> c1 >> c2 >> c3;
    std::cout << "Default  behavior:"
                 " c1 = " << c1 << 
                 " c2 = " << c2 << 
                 " c3 = " << c3 << '\n';
    std::istringstream("a b c") >> std::noskipws >> c1 >> c2 >> c3;
    std::cout << "noskipws behavior:" 
                 " c1 = " << c1 <<
                 " c2 = " << c2 <<
                 " c3 = " << c3 << '\n';
}

Output:

Default  behavior: c1 = a c2 = b c3 = c
noskipws behavior: c1 = a c2 =   c3 = b

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