};intmain() {usingnamespace std::placeholders;// for _1, _2, _3...// demonstrates argument reordering and pass-by-referenceint n =7;// (_1 and _2 are from std::placeholders, and represent future// arguments that
可以看到,std::bind的参数是以 拷贝的方式,使用 std::ref 的方式可以实现参数在std::bind的引用。 #include<random>#include<iostream>#include<memory>#include<functional>voidf(intn1,intn2,intn3,constint& n4,intn5){ std::cout << n1 <<' '<< n2 <<' '<< n3 <<' '<< n4 <<' '<< n5...
{usingnamespacestd::placeholders;// for _1, _2, _3...std::cout<<"1) argument reordering and pass-by-reference: ";intn=7;// (_1 and _2 are from std::placeholders, and represent future// arguments that will be passed to f1)autof1=std::bind(f, _2,42, _1,std::cref(n), ...
};intmain(){usingnamespacestd::placeholders;// for _1, _2, _3...// demonstrates argument reordering and pass-by-referenceintn =7;// (_1 and _2 are from std::placeholders, and represent future// arguments that will be passed to f1)autof1 = std::bind(f, _2,42, _1, std::cr...
根据cppreference对第二种情况的描述：If the stored argument arg is of type T for whichstd::is_...
argument reordering and pass-by-reference: 2 42 1 1001 7 2) achieving the same effect using a lambda: 2.bind对Class的使用例子: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 #include <random> #include <iostream> #include <memory> #include <functional> struct Foo { void print_sum(int...
根据cppreference对第二种情况的描述: • If the stored argumentargis of typeTfor which std::is_bind_expression ::value == true (for example, anotherbindexpression was passed directly into the initial call tobind), thenbindperforms function composition: instead of passing the function object that...
f-Callable object (function object, pointer to function, reference to function, pointer to member function, or pointer to data member) that will be bound to some arguments args-list of arguments to bind, with the unbound arguments replaced by the placeholders _1, _2, _3... of namespace ...
return n1; } struct Foo { void print_sum(int n1, int n2) { std::cout << n1+n2 << '\n'; } int data = 10; }; int main() { using namespace std::placeholders; // for _1, _2, _3... // demonstrates argument reordering and pass-by-reference ...
std::cout << "1) argument reordering and pass-by-reference: "; int n = 7; // (_1 and _2 are from std::placeholders, and represent future // arguments that will be passed to f1) auto f1 = std::bind(f, _2, 42, _1, std::cref(n), n); ...