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Copy path3.1.lambda.basic.cpp
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62 lines (54 loc) 路 1.5 KB
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//
// 3.1.lambda.basic.cpp
// chapter 03 runtime enhancement
// modern c++ tutorial
//
// created by changkun at changkun.de
// https://github.com/changkun/modern-cpp-tutorial
//
#include <iostream>
#include <memory> // std::make_unique
#include <utility> // std::move
void lambda_value_capture() {
int value = 1;
auto copy_value = [value] {
return value;
};
value = 100;
auto stored_value = copy_value();
std::cout << "stored_value = " << stored_value << std::endl;
// At this moment, stored_value == 1, and value == 100.
// Because copy_value has copied when its was created.
}
void lambda_reference_capture() {
int value = 1;
auto copy_value = [&value] {
return value;
};
value = 100;
auto stored_value = copy_value();
std::cout << "stored_value = " << stored_value << std::endl;
// At this moment, stored_value == 100, value == 100.
// Because copy_value stores reference
}
void lambda_expression_capture() {
auto important = std::make_unique<int>(1);
auto add = [v1 = 1, v2 = std::move(important)](int x, int y) -> int {
return x+y+v1+(*v2);
};
std::cout << add(3,4) << std::endl;
}
void lambda_generic() {
auto generic = [](auto x, auto y) {
return x+y;
};
std::cout << generic(1, 2) << std::endl;
std::cout << generic(1.1, 2.2) << std::endl;
}
int main() {
lambda_value_capture();
lambda_reference_capture();
lambda_expression_capture();
lambda_generic();
return 0;
}