std::skipws, std::noskipws
Min standard notice:
Header: <ios>
Enables or disables skipping of leading whitespace by the formatted input functions (enabled by default). Has no effect on output.
# Declarations
std::ios_base& skipws( std::ios_base& str );
std::ios_base& noskipws( std::ios_base& str );
# Parameters
str: reference to I/O stream
# Return value
str (reference to the stream after manipulation).
# Example
#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';
}