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authorbk2dcradle <ankitsultana@gmail.com>2016-01-08 01:21:38 +0530
committerbk2dcradle <ankitsultana@gmail.com>2016-01-08 01:21:38 +0530
commite6866f5a26dab28d2d1b5628fbb18139c36a5139 (patch)
tree1a48c85ee311b54a4c1cd08c49e2652b09e386e5 /c++.html.markdown
parent19ead59c1fde3623bc29e1fe56f33f2587c97d3a (diff)
More Fixes
Diffstat (limited to 'c++.html.markdown')
-rw-r--r--c++.html.markdown25
1 files changed, 14 insertions, 11 deletions
diff --git a/c++.html.markdown b/c++.html.markdown
index 31dbe064..44cad665 100644
--- a/c++.html.markdown
+++ b/c++.html.markdown
@@ -840,16 +840,22 @@ tester.push_back(make_pair(5, 0));
// sort is from the <algorithm> header
sort(tester.begin(), tester.end(), [](const pair<int, int>& lhs, const pair<int, int>& rhs) {
- return lhs.second < rhs.second;
- });
+ return lhs.second < rhs.second;
+ });
// Notice the syntax of the lambda expression,
-// [] in the lambda is used to "capture" variables.
-// For Example:
+// [] in the lambda is used to "capture" variables
+// The "Capture List" defines what from the outside of the lambda should be available inside the function body and how.
+// It can be either:
+// 1. a value : [x]
+// 2. a reference : [&x]
+// 3. any variable currently in scope by reference [&]
+// 4. same as 3, but by value [=]
+// Example:
vector<int> dog_ids;
// number_of_dogs = 3;
-for(int i = 0; i < 3; i++){
+for(int i = 0; i < 3; i++) {
dog_ids.push_back(i);
}
@@ -861,13 +867,10 @@ int weight[3] = {30, 50, 10};
// Here's where lambda expressions come in handy
sort(dog_ids.begin(), dog_ids.end(), [&weight](const int &lhs, const int &rhs) {
- return weight[lhs] < weight[rhs];
- });
+ return weight[lhs] < weight[rhs];
+ });
// Note we captured "weight" by reference in the above example.
-
-// lambda are really useful for the case of structs
-// You can use lambda expressions instead of overloading
-// the "<" operator
+// More on Lambdas in C++ : http://stackoverflow.com/questions/7627098/what-is-a-lambda-expression-in-c11
///////////////////////////////
// Range For (C++11 and above)