#includeIn this example, the CallArgs callee is used in conjunction with the Boost.Bind library to bind values to the function foo(). The function foo() takes three integer arguments, so the template placeholders _1, _2, and _3 are used to specify the order of the arguments. When the bind expression is evaluated with the values 1, 2, and 3, the CallArgs callee is used to create a callable object that calls foo() with the bound arguments. Package Library: Boost.Bind is a C++ library that provides a general-purpose binding framework for function objects and other callable entities. It is part of the Boost C++ Libraries collection, which is an open-source project that provides a range of high-quality libraries for C++ programming.#include void foo(int a, int b, int c) { std::cout << "The sum of " << a << ", " << b << ", and " << c << " is " << a + b + c << std::endl; } int main() { boost::bind(&foo, _1, _2, _3)(1, 2, 3); return 0; }