The argument that if the compiler can provide a default copy constructor, it should be able to provide a similar default operator==() makes a certain amount of sense. I think that the reason for the decision not to provide a compiler-generated default for this operator can be guessed by what Stroustrup said about the default … Read more
Yes, 0 is an Octal literal in C++. As per the C++ Standard: 2.14.2 Integer literals [lex.icon] integer-literal: decimal-literal integer-suffixopt octal-literal integer-suffixopt hexadecimal-literal integer-suffixopt decimal-literal: nonzero-digit decimal-literal digit octal-literal: 0 <——————–<Here> octal-literal octal-digit
By default, use namespaced functions. Classes are to build objects, not to replace namespaces. In Object Oriented code Scott Meyers wrote a whole Item for his Effective C++ book on this topic, “Prefer non-member non-friend functions to member functions”. I found an online reference to this principle in an article from Herb Sutter: http://www.gotw.ca/gotw/084.htm The … Read more
Two things must be done. First add the directory to be included: target_include_directories(test PRIVATE ${YOUR_DIRECTORY}) In case you are stuck with a very old CMake version (2.8.10 or older) without support for target_include_directories, you can also use the legacy include_directories instead: include_directories(${YOUR_DIRECTORY}) Then you also must add the header files to the list of your … Read more
http://www.cplusplus.com/reference/std/iterator/ has a handy chart that details the specs of ยง 24.2.2 of the C++11 standard. Basically, the iterators have tags that describe the valid operations, and the tags have a hierarchy. Below is purely symbolic, these classes don’t actually exist as such. iterator { iterator(const iterator&); ~iterator(); iterator& operator=(const iterator&); iterator& operator++(); //prefix increment … Read more
std::vector is a template class that encapsulate a dynamic array1, stored in the heap, that grows and shrinks automatically if elements are added or removed. It provides all the hooks (begin(), end(), iterators, etc) that make it work fine with the rest of the STL. It also has several useful methods that let you perform … Read more
The != operator serves this purpose for bool values.
The difference is that std::make_shared performs one heap-allocation, whereas calling the std::shared_ptr constructor performs two. Where do the heap-allocations happen? std::shared_ptr manages two entities: the control block (stores meta data such as ref-counts, type-erased deleter, etc) the object being managed std::make_shared performs a single heap-allocation accounting for the space necessary for both the control block … Read more
foo->bar() is the same as (*foo).bar(). The parenthesizes above are necessary because of the binding strength of the * and . operators. *foo.bar() wouldn’t work because Dot (.) operator is evaluated first (see operator precedence) The Dot (.) operator can’t be overloaded, arrow (->) operator can be overloaded. The Dot (.) operator can’t be applied … Read more
If you want to make it clear what each initializer value is, just split it up on multiple lines, with a comment on each: address temp_addres = { 0, // street_no nullptr, // street_name “Hamilton”, // city “Ontario”, // prov nullptr, // postal_code };