It is a template function that returns areference_wrapperobject. Areference_wrapperis a class template that wraps a reference in a concrete object. Actually you could do something like: 1 2 3 4 5 6 7 8 9 10 11 1
reference_wrapper<Ty> 是可构造副本和可指定副本的包装器,它包装对某个 Ty 类型对象或函数的引用,并具有指向该类型对象的指针。 reference_wrapper 可用于将引用存储在标准容器内,并根据对 std::bind 的引用传递对象。类型Ty 必须是一种对象类型或函数类型,或会在编译时失败的静态断言。帮助程序函数 std::ref ...
一个reference_wrapper<T>类型的对象,可以作为实参,传入 形参类型为T的函数中。 #include<iostream>#include<functional>voidadd(inta,intb,int&r){r=a+b;}intmain(){intresult=0;//auto func = std::bind(add, std::placeholders::_1, 10, result);//out:0autofunc=std::bind(add,std::placeholders...
#include <iostream> #include <vector> #include <functional> int main() { int a = 10; int b = 20; int c = 30; std::vector<std::reference_wrapper<int>> vec; vec.push_back(std::ref(a)); vec.push_back(std::ref(b)); vec.push_back(std::ref(c)); for (auto& ref : vec)...
在上述示例中,我们声明了三个整数变量a、b、c,并使用std::ref函数将它们包装为reference_wrapper对象,然后将这些reference_wrapper对象作为元素初始化了一个向量vec。接下来,我们通过修改reference_wrapper对象来修改原始变量的值,并通过reference_wrapper对象的get()函数来访问原始变量的值。 使用reference_wrappers初始化...
// std__functional__reference_wrapper_get.cpp // compile with: /EHsc #include <functional> #include <iostream> int main() { int i = 1; std::reference_wrapper<int> rwi(i); std::cout << "i = " << i << std::endl; std::cout << "rwi = " << rwi << std::endl; rwi.get...
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Our backend SDK libraries provide a wrapper for the Admin API, enabling you to use your native programming language of choice. When using an SDK, request building and authentication are handled automatically, and the JSON response is parsed and returned. For example, you can use the following...
This middleware is simply a wrapper for the json(), urlencoded(), and multipart() middleware. app.use(express.bodyParser()) // is equivalent to: app.use(express.json()) app.use(express.urlencoded()) app.use(express.multipart()) For security sake, it’s better to disable file ...
in_placein_place_typein_place_indexin_place_tin_place_type_tin_place_index_t (C++17) in-place construction tag (tag) optional (C++17) a wrapper that may or may not hold an object (class template) any (C++17) objects that hold instances of anyCopyConstructibletype (class)...