C + + 's new and delete operators

The functions of dynamically allocating and freeing memory in C are malloc calloc and free, while in C + + the new new[] Delete delete[] is used to request dynamic space and free space.

Note: new, new[], delete, and delete[] are operators, not functions; New and delete are also keywords for C + +.

The operator new is used to dynamically allocate a single space , while new[] is used to dynamically allocate an array, the operator delete is used to release the space allocated by new, and delete[] is used to release an array of new[] allocations.

The following is a simple example code

using namespacestd;intMain () {int*p =New int(5); int*q =New int[Ten]; *q = the; Q++; *q =293; cout<< *q <<Endl; cout<< *p <<Endl; Deletep; return 0;}

Run results

293 5

To avoid memory leaks, normally the new and delete, new[], and delete[] operators should appear paired, and do not mix these operators with the C language's dynamically allocated memory and several functions that release memory. It is recommended that you use the new, new[], delete, and delete[] operators for dynamic memory allocation and deallocation when writing C + + programs, rather than using memory allocation and deallocation functions in C, because new, new[], delete, and delete[] Operators can use some features of C + +, such as the constructors and destructors of classes, to better manage the memory of C + + programs.

C + + 's new and delete operators