Binds a given argument x to a first or second parameter of the given binary function object f. That is, stores x within the resulting wrapper, which, if called, passes x as the first or the second parameter of f.
1)Binds the first argument of
fto
x. Effectively calls
std::binder1st<F>(f, typename F::first_argument_type(x)).
2)Binds the second argument of
fto
x. Effectively calls
std::binder2nd<F>(f, typename F::second_argument_type(x)).
[edit] Parameters f - pointer to a function to bind an argument to x - argument to bind to f [edit] Return valueA function object wrapping f and x.
[edit] ExceptionsMay throw implementation-defined exceptions.
[edit] Example#include <algorithm> #include <cmath> #include <cstddef> #include <functional> #include <iomanip> #include <iostream> #include <vector> int main() { std::vector<double> a = {0, 30, 45, 60, 90, 180}; std::vector<double> r(a.size()); const double pi = std::acos(-1); // since C++20 use std::numbers::pi std::transform(a.begin(), a.end(), r.begin(), std::bind1st(std::multiplies<double>(), pi / 180.0)); // an equivalent lambda is: [pi](double a) { return a * pi / 180.0; }); for (std::size_t n = 0; n < a.size(); ++n) std::cout << std::setw(3) << a[n] << "° = " << std::fixed << r[n] << " rad\n" << std::defaultfloat; }
Output:
0° = 0.000000 rad 30° = 0.523599 rad 45° = 0.785398 rad 60° = 1.047198 rad 90° = 1.570796 rad 180° = 3.141593 rad[edit] See also
(deprecated in C++11)(removed in C++17)
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