Published Jul 24, 2019
[
C++11 introduces lambadas allow you to write inline, anonymous functor.
void func3(vector<int>& v){
for_each(v.begin() v.end(), [](int){
// do something
})
}
Lambda functions are just syntactic sugar for anonymous functors.
In simple cases the return type of the lambda is deduced for you,
void func4(vector<double>& v){
transform(v.begin(), v.end(), v.begin()), [](double){
return d < 0.000001 ? 0 : d;
}
}
To explicitly specify a return type, using -> T
void func4(vector<double>& v){
transform(v.begin(), v.end(), v.begin(), [](double d) -> double {
return d < 0.001 ? 0 : d;
})
}
void func5(vector<double>& v, const double& epsilon){
transform(v.begin(), v.end(), v.begin(), [epsilon](double d) -> double {
return d < epsilon ? 0 : d;
})
}
[&epsilon] capture by reference[&] captures all variables used in the lambda by reference[=] captures all variables used in the lambda by value[&, epsilon] captures variables like with [&], but epsilon by value[=, &epsilon] captures variables like with [&], but epsilon by referenceReferences: https://stackoverflow.com/questions/7627098/what-is-a-lambda-expression-in-c11