Logo
D Errors
Codes / Error Code 012

Error Code 012

Overview

This error indicates that memory allocated during program execution was not properly released, leading to resource exhaustion over time. Memory leaks are common in programs that manage memory manually.

Details

  • Common Causes:

    • Forgetting to free memory allocated with malloc or similar functions.
    • Circular references in garbage-collected environments.
    • Holding references to objects that are no longer needed.

  • Example:

import core.stdc.stdlib;

void main() {
    int* ptr = cast(int*) malloc(int.sizeof);
    *ptr = 42;
    // Memory leak: no call to free(ptr)
}
  • Solution:
    • Free allocated memory when it is no longer needed: 
      import core.stdc.stdlib;

void main() {
    int* ptr = cast(int*) malloc(int.sizeof);
    *ptr = 42;
    free(ptr); // Proper memory management
}
    • Use scope-bound resource management or RAII (Resource Acquisition Is Initialization): 
      struct Resource {
    this() { writeln("Acquired resource"); }
    ~this() { writeln("Released resource"); }
}

void main() {
    {
        auto r = Resource();
    } // Automatically releases the resource
}