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C++ Istream Library - ws
Description
It is used to extracts as many whitespace characters as possible from the current position in the input sequence. The extraction stops as soon as a non-whitespace character is found. These extracted whitespace characters are discarded.
Declaration
Following is the declaration for std::ws.
for istream istream& ws (istream& is); basic template template <class charT, class traits> basic_istream<charT,traits>& ws (basic_istream<charT,traits>& is);
Parameters
is − Input stream object from where whitespaces are extracted.
Exceptions
Basic guarantee − if an exception is thrown, the stream is in a valid state.
Data races
Modifies the stream object is.
Example
In below example explains about std::ws.
#include <iostream> #include <sstream> int main () { char a[10], b[10]; std::istringstream iss ("one \n \t two"); iss >> std::noskipws; iss >> a >> std::ws >> b; std::cout << a << ", " << b << '\n'; return 0; }
Let us compile and run the above program, this will produce the following result −
one, two
istream.htm
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