Lambda Expressions in C++

Mar 16, 2017Download as PPTX, PDF0 likes660 views

A brief talk given at HSV.cpp meetup on 3/15/17 concerning Lambdas in C++ Video is here: https://youtu.be/5splHkTJ2LY

[](){}();
Or How I Learned To Stop Worrying and Love the
Lambda
Pat Viafore
HSV.cpp Meetup
3/15/2017

Lambda Expressions
Lambda Calculus
Church-Turing Thesis
Conversion and Reduction
Complicated Mathematics
Functional Programming
Underpinnings of Computer Science
Lisp?

void print(std::function<bool()> func)
{
std::string str = func() ? "true" : "false";
std::cout << str << “n”;
}
auto isFiveGreaterThanThree = [](){ return 5 > 3; };
print(isFiveGreaterThanThree);

void print(int param, std::function<bool(int)> func)
{
std::string str = func(param) ? "true" : "false";
std::cout << str << “n”;
}
auto isGreaterThanThree = [](int num){ return num > 3; };
print(5, isGreaterThanThree);

[](){}
Capture
List
Parameters
Function
Body

void print(int num, std::function<bool(int)> func)
{
std::string str = func(num) ? "true" : "false";
std::cout << str << “n”;
}
int target = 3;
auto isGreaterThan = [target](int n){ return n > target; };
target = 6;
print(5, isGreaterThan);

Capture List
By Value By Reference
[this]
[a,b]
[=]
[&a,&b]
[&]
Prefer Explicit Captures Over
Default Captures

class A {
public:
int x;
A(): x(10) {}
std::function<bool()> getLambda()
{
return [=](){ return x+2; };
}
};
int main()
{
A* a = new A();
auto lambda = a->getLambda();
delete a;
lambda();
}
This is implicitly this->x. The this
parameter is what gets captured, not
x.

class A {
public:
int x;
A(): x(10) {}
std::function<bool()> getLambda()
{
return [copy=x](){ return copy+2; };
}
};
int main()
{
A* a = new A();
auto lambda = a->getLambda();
delete a;
lambda();
}
C++14 gives us init captures,
where we can initialize the
variables we capture (useful for
any non-local captures)

$Why? Dependency Injection Pass a function to inject a dependency Functional Programming Styles Mapping and Filtering just got a whole lot easier Algorithm Library auto isSpecial = [](MacAddress& mac){ return MacAddress::ItuAddress == mac; }; any_of(macs.begin(), macs.end(), isSpecial); count_if(macs.begin(), macs.end(), isSpecial); replace_if(macs.begin(), macs.end(), isSpecial, MacAddress::BlankMacAddress); sort(ips.begin(), ips.end(), [](IpAddressV4& ip1, IpAddressV4& ip2) { return ip1.getNetworkByteOrder() < ip2.getNetworkByteOrder()); });$

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Lambda Expressions in C++

1. [](){}(); Or How I Learned To Stop Worrying and Love the Lambda Pat Viafore HSV.cpp Meetup 3/15/2017

2. Lambda Expressions

3. Lambda Expressions Lambda Calculus Church-Turing Thesis Conversion and Reduction Complicated Mathematics Functional Programming Underpinnings of Computer Science Lisp?

5. Anonymous Functions

6. [](){}

7. [](){}

8. [](){} Function Body

9. void print(std::function<bool()> func) { std::string str = func() ? "true" : "false"; std::cout << str << “n”; } auto isFiveGreaterThanThree = [](){ return 5 > 3; }; print(isFiveGreaterThanThree);

10. [](){} Parameters Function Body

11. void print(int param, std::function<bool(int)> func) { std::string str = func(param) ? "true" : "false"; std::cout << str << “n”; } auto isGreaterThanThree = [](int num){ return num > 3; }; print(5, isGreaterThanThree);

12. [](){} Capture List Parameters Function Body

13. void print(int num, std::function<bool(int)> func) { std::string str = func(num) ? "true" : "false"; std::cout << str << “n”; } int target = 3; auto isGreaterThan = [target](int n){ return n > target; }; target = 6; print(5, isGreaterThan);

14. Capture List By Value By Reference [this] [a,b] [=] [&a,&b] [&] Prefer Explicit Captures Over Default Captures

15. class A { public: int x; A(): x(10) {} std::function<bool()> getLambda() { return [=](){ return x+2; }; } }; int main() { A* a = new A(); auto lambda = a->getLambda(); delete a; lambda(); } This is implicitly this->x. The this parameter is what gets captured, not x.

16. class A { public: int x; A(): x(10) {} std::function<bool()> getLambda() { return [copy=x](){ return copy+2; }; } }; int main() { A* a = new A(); auto lambda = a->getLambda(); delete a; lambda(); } C++14 gives us init captures, where we can initialize the variables we capture (useful for any non-local captures)

17. Why? Dependency Injection Pass a function to inject a dependency Functional Programming Styles Mapping and Filtering just got a whole lot easier Algorithm Library auto isSpecial = [](MacAddress& mac){ return MacAddress::ItuAddress == mac; }; any_of(macs.begin(), macs.end(), isSpecial); count_if(macs.begin(), macs.end(), isSpecial); replace_if(macs.begin(), macs.end(), isSpecial, MacAddress::BlankMacAddress); sort(ips.begin(), ips.end(), [](IpAddressV4& ip1, IpAddressV4& ip2) { return ip1.getNetworkByteOrder() < ip2.getNetworkByteOrder()); });

18. [](){} Capture List Parameters Function Body ();

19. Twitter: @PatViaforever

Lambda Expressions in C++

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