C++ High Performance

Copy-constructing an object

When copying an object handling a resource, a new resource needs to be allocated, and the resource from the source object needs to be copied so that the two objects are completely separated. The resource allocations of copy construction in the following code block is illustrated as follows:

auto a = Object{}; 
auto b = a; // Copy-construction 

The following image illustrates the process:

Copying an object with resources

The allocation and copying is slow and, in many cases, the source object isn't needed anymore. With move semantics, the compiler detects cases like these where the old object is not tied to a variable, ...