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Merge pull request #2137 from geoffliu/cleanup-cpp
Remove a section from c++, fixes #2130
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cd16626c8f
@ -330,7 +330,7 @@ ECarTypes GetPreferredCarType()
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}
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// As of C++11 there is an easy way to assign a type to the enum which can be
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// useful in serialization of data and converting enums back-and-forth between
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// useful in serialization of data and converting enums back-and-forth between
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// the desired type and their respective constants
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enum ECarTypes : uint8_t
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{
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@ -352,7 +352,7 @@ void WritePreferredCarTypeToFile(ECarTypes InputCarType)
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}
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// On the other hand you may not want enums to be accidentally cast to an integer
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// type or to other enums so it is instead possible to create an enum class which
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// type or to other enums so it is instead possible to create an enum class which
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// won't be implicitly converted
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enum class ECarTypes : uint8_t
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{
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@ -468,7 +468,7 @@ int main() {
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// Inheritance:
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// This class inherits everything public and protected from the Dog class
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// as well as private but may not directly access private members/methods
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// as well as private but may not directly access private members/methods
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// without a public or protected method for doing so
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class OwnedDog : public Dog {
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@ -825,10 +825,10 @@ fooMap.find(Foo(1)); //true
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///////////////////////////////////////
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// lambdas are a convenient way of defining an anonymous function
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// object right at the location where it is invoked or passed as
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// object right at the location where it is invoked or passed as
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// an argument to a function.
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// For example, consider sorting a vector of pairs using the second
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// For example, consider sorting a vector of pairs using the second
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// value of the pair
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vector<pair<int, int> > tester;
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@ -856,7 +856,7 @@ sort(tester.begin(), tester.end(), [](const pair<int, int>& lhs, const pair<int,
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vector<int> dog_ids;
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// number_of_dogs = 3;
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for(int i = 0; i < 3; i++) {
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dog_ids.push_back(i);
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dog_ids.push_back(i);
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}
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int weight[3] = {30, 50, 10};
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@ -940,29 +940,13 @@ Foo f1;
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f1 = f2;
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// How to truly clear a container:
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class Foo { ... };
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vector<Foo> v;
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for (int i = 0; i < 10; ++i)
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v.push_back(Foo());
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// Following line sets size of v to 0, but destructors don't get called
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// and resources aren't released!
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v.clear();
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v.push_back(Foo()); // New value is copied into the first Foo we inserted
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// Truly destroys all values in v. See section about temporary objects for
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// explanation of why this works.
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v.swap(vector<Foo>());
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///////////////////////////////////////
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// Tuples (C++11 and above)
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///////////////////////////////////////
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#include<tuple>
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// Conceptually, Tuples are similar to old data structures (C-like structs) but instead of having named data members ,
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// Conceptually, Tuples are similar to old data structures (C-like structs) but instead of having named data members ,
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// its elements are accessed by their order in the tuple.
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// We start with constructing a tuple.
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@ -995,7 +979,7 @@ cout << tuple_size<decltype(third)>::value << "\n"; // prints: 3
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// tuple_cat concatenates the elements of all the tuples in the same order.
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auto concatenated_tuple = tuple_cat(first, second, third);
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// concatenated_tuple becomes = (10, 'A', 1e9, 15, 11, 'A' ,3.14141)
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// concatenated_tuple becomes = (10, 'A', 1e9, 15, 11, 'A' ,3.14141)
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cout << get<0>(concatenated_tuple) << "\n"; // prints: 10
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cout << get<3>(concatenated_tuple) << "\n"; // prints: 15
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