}voidMyFunc2(intval1,intval2) { std::cout<< __PRETTY_FUNCTION__ << val1 + val2 <<std::endl; }voidFunctionBindTest(void) { std::function<void(int)> pb = std::bind(MyFunc1,10, std::placeholders::_1); pb(1); pb= std::bind(MyFunc2,10, std::placeholders::_1); pb(2); ...
std::function<void(const std_msgs::msg::Header::SharedPtr)> callback = std::bind(&MyNode::callback, node.get(), std::placeholders::_1, topic_name); node->subscriber = node->create_subscription<std_msgs::msg::Header>(topic_name, callback); To summarize: I think the failing case ...
{ using namespace std::placeholders; std::vector<std::string> words = { "the", "quick", "brown", "fox", "jumps", "over", "the", "lazy", "turtle" }; const int max_length(5); auto count = std::count_if(words.begin(), words.end(), std::bind(check_size, _1, max_...
auto callback = std::bind(&CDROM_Interface_Ioctl::CdAudioCallback, this, std::placeholders::_1); mixer_channel = MIXER_AddChannel(callback, REDBOOK_PCM_FRAMES_PER_SECOND, name.c_str(), {ChannelFeature::Stereo, ChannelFeature::DigitalAudio});...
1个 函数对象 [2]将 多元(参数个数 n > 1) callableObj 转成 1元或(n-1) 元callableObj,即 只绑定部分参数 (4) "占位符" std::placeholders::_1/... 该位置 将在 函数调用时,被 传入的 第1/... 个实参替代 (5) 简化和增强了 标准库 bind1st /...
1/*关于C++仿函数*/2#include<iostream>3#include<functional>4using namespace std;5using namespace std::placeholders;67template<typenameR1,typenameR2>8struct Calc9{10voidadd(R1a){11cout<<a<<endl;12};13voidadd_1(R1a,R1b){14cout<<a+b<<endl;15}16};1718intmain(int argc,char*args[]){192...
5 using namespace std::placeholders; 6 7 template <typename R1 , typename R2> 8 struct Calc 9 { 10 void add(R1 a) { 11 cout << a << endl; 12 }; 13 void add_1(R1 a, R1 b) { 14 cout << a + b << endl; 15 } ...
using namespace std::placeholders; //仿函数,创建一个函数指针,引用一个结构体内部或者一个类内部的公有函数 struct MyStruct { void add(int a) { cout << a << endl; } void add2(int a,int b) { cout << a +b<< endl; } void add3(int a, int b,int c) ...
std::functionfunc(std::bind(&Pred, std::placeholders::_1, "name")); Error: use of undeclared identifier 'std' c++, error: use of undeclared identifier 'std' c++. Ask Question Asked 2 years, 5 months ago. Modified 2 years, 5 months ago. Viewed 14k times 4 I am new to coding i...
1/*关于C++仿函数*/2#include<iostream>3#include<functional>4usingnamespacestd;5usingnamespacestd::placeholders;67template <typename R1 , typename R2>8structCalc9{10voidadd(R1 a) {11cout << a <<endl;12};13voidadd_1(R1 a, R1 b) {14cout << a + b <<endl;15}16};1718intmain(intar...