C++ In a Nutshell

Name

bind1st function template — Creates a binder1st function object

Synopsis

template <typename Operation, typename T>
binder1st<Operation> bind1st(const Operation& op, const T& x);

The bind1st function is a convenient way to construct a binder1st object. Use bind1st when you have a binary function and always want to supply the same value as the first argument to the function.

Example

Suppose you have a container of data points, and you want to count the number of points that exceed a threshold—in other words, where the threshold is less than or equal to the data point. Here is one way to do this:

std::cout
  << std::count_if(data.begin(  ), data.end(  ),
       std::bind1st(std::less_equal<double>(  ), threshold))
  << '\n';

See Also

bind2nd function template, binder1st class template