How deeply does Learn C++ by Example cover move constructor?

Explains rvalue overload selection and resource reuse, but only sketches move semantics and perfect forwarding.

Move constructor

A move constructor is a constructor that initializes an object by taking ownership of resources from another object, typically an rvalue.

A move constructor initializes an object from an rvalue by reusing its resources instead of copying them. For std::vector, this can transfer ownership of the element storage from a temporary vector. section 2.2.3

Generating Pascal’s triangle

triangle.push_back(get_next_row(triangle.back())) passes a temporary row to push_back. The T&& overload can move-construct the new vector, avoiding the copy required by push_back(const T&). section 2.2.3

The important rules are:

std::move casts a named value back to an rvalue; it does not itself move anything. section 2.2.3
After moving, the source object remains valid but has an unspecified state and is generally no longer useful. section 2.2.3

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100 C++ Mistakes and How to Avoid ThemA move constructor is a C++ special member function that initializes an object by transferring resources from a source object.

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Related concepts

big fivepart of · The rule of five is a C++ guideline that classes managing resources should consider defining a destructor, copy constructor, copy assignment operator, move constructor, and move assignment operator.
initializerkind of · An initializer is a function, declaration, or language construct that establishes the initial value or state of an object, value, computation, or process.
copy constructorcontrasts with · A copy constructor is a constructor that initializes a new object from an existing object of the same class or type.
moveimplements · Move semantics describe the transfer of a value or its resources to another binding or object rather than duplicating them.

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