lambda c++
- Good website to learn lambda in c++: https://docs.microsoft.com/en-us/cpp/cpp/lambda-expressions-in-cpp https://en.cppreference.com/w/cpp/language/lambda https://www.geeksforgeeks.org/lambda-expression-in-c/ https://stackoverflow.com/questions/7627098/what-is-a-lambda-expression-in-c11 https://linuxhint.com/lambda-expressions-in-c/
cpp lambda function
#include <iostream> using namespace std; bool isGreater = [](int a, int b){ return a > b; } int main() { cout << isGreater(5, 2) << endl; // Output: 1 return 0; }
lambda c++
#include <iostream> #include <string> // returns a lambda auto makeWalrus(const std::string& name) { // Capture name by reference and return the lambda. return [&]() { std::cout << "I am a walrus, my name is " << name << '\n'; // Undefined behavior }; } int main() { // Create a new walrus whose name is Roofus. // sayName is the lambda returned by makeWalrus. auto sayName{ makeWalrus("Roofus") }; // Call the lambda function that makeWalrus returned. sayName(); return 0; }
cpp lambda
struct X { int x, y; int operator()(int); void f() { // the context of the following lambda is the member function X::f [=]()->int { return operator()(this->x + y); // X::operator()(this->x + (*this).y) // this has type X* }; } };
lambda function in c++
//lambda function for sorting vector ascending sort(vec.begin(),vec.end(),[](int &a, int &b){ return a<b; }); //lambda function for sorting vector of vector ascending based on first value sort(vec.begin(),vec.end(),[](vector<int> &a, vector<int> &b){ return a[0]<b[0]; });
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