C++ std::bind

hehui0921

于 2024-07-07 15:56:24 发布

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分类专栏： c++入门系列文章标签： c++ 算法开发语言

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#include <iostream>
#include <sstream>
#include <cassert>
#include <array>
#include <limits>
#include <set>
#include <unordered_map>
#include <functional>
#include <memory>
#include <ostream>
#include <string>
#include <vector>
#include <map>
#include <optional>
#include <chrono>
#include <mutex>
#include <thread>
#include <utility>
#include <typeinfo>
#include <queue>


std::string add(std::string &&a, std::string &&b)
{
  return a + b;
}

int main()
{

  auto f1 = std::bind(add, "1", "2");
  assert(f1() == "12");

  auto f2 = std::bind(add, "1", std::placeholders::_1);
  assert(f2("2") == "12");

  auto f3 = std::bind(add, std::placeholders::_1, std::placeholders::_2);
  assert(f3("1", "2") == "12");

  auto f4 = std::bind(add, std::placeholders::_2, std::placeholders::_1);
  assert(f4("1", "2") == "21");

  return 0;
}