What are the new features in C 17

C++17 is currently feature complete, therefore major modifications are unlikely.

Hundreds of ideas for C++17 were submitted.

Which of these features was added to C++17?

Which of those features will be available when the compiler updates to C++17 while using a C++ compiler that supports "C++1z"?

Jul 26, 2022 in C++ by Nicholas
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What are the differences between struct and class in C++?

I now want to understand the distinctions ...READ MORE

Aug 17, 2022 in C++ by Nicholas
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The new syntax "= default" in C++11

A defaulted default function Object() { [native code] } is defined as a user-defined default function Object() { [native code] } with an empty compound statement and no initialization list. I'll give you an example to demonstrate the difference: #include <iostream> using namespace std; class A { public: ...READ MORE

answered Jun 7, 2022 in C++ by Damon
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Are virtual functions the only way to achieve Runtime Polymorphism in C++?

fprintf is a polymorphism function in the C programming language. It can print to a file, stdout, a printer, a socket, or whatever else the system can represent as a stream if you supply it different handles. FILE* file = fopen("output.txt", "w"); ...READ MORE

answered Jun 21, 2022 in C++ by Damon
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What is the best way to use a HashMap in C++?

The ordered and unordered map containers (std::map and std::unordered map) are included in the standard library. The items in an ordered map are sorted by key, and insert and access are in O (log n). For ordered maps, the standard library often use red black trees. However, this is only an implementation detail. Insert and access are in O in an unordered map (1). It is simply another term for a hashtable. An illustration using (ordered) std::map: #include <map> #include <iostream> #include <cassert> int main(int argc, char ...READ MORE

answered Jun 10, 2022 in C++ by Damon
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What is the difference between public, private, and protected inheritance in C++?

To begin answering that question, let me characterise member accessors in my own terms. If you already know this, proceed to the section "next:". I'm aware of three types of accessors: public, protected, and private. Let: class Base { public: ...READ MORE

answered Jul 11, 2022 in C++ by Damon
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What is the meaning of "generic programming" in c++?

What does generic programming in C++ mean? I'm ...READ MORE

Jul 11, 2022 in C++ by Nicholas
• 7,760 points • 628 views

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What is this weird colon-member (" : ") syntax in the constructor?

Foo(int num): bar(num) In C++, this is known as a Member Initializer List. Simply put, it sets the value of your member bar to num. There is a significant difference between initializing a member with the Member initializer list and assigning a value to it within the function Object() { [native code] } body. When you use the Member initializer list to initialise fields, the constructors are only called once, and the object is constructed and initialised in a single operation. If you use assignment, the fields will be initialised with default constructors and then reassigned with actual values (via the assignment operator). As you can see, there is an extra overhead of creation and assignment in the latter, which may be significant for user defined classes. Cost of Member Initialization =Object ...READ MORE