How Can I Override the Global `new` and `delete` Operators in C ?

Overriding Global Operators: Replacing new and delete

In a complex codebase, ensuring consistent use of custom new and delete operators can be challenging. One issue is that external libraries and STL usage may bypass custom memory management.

Instead of including overloads in multiple files, a global replacement can be achieved. Link a separate translation unit (TU) that defines these operators. This TU provides the following functions:

<code class="cpp">void * operator new(std::size_t n) throw(std::bad_alloc);
void operator delete(void * p) throw();</code>

Including or similar headers may be necessary to resolve standard library names. In C 11 and above, decltype(sizeof(0)) can replace std::size_t and dynamic exception specifications can be omitted.

<code class="cpp">void * operator new(decltype(sizeof(0)) n) noexcept(false);</code>

By linking this TU, the custom new and delete operators become active throughout the program, ensuring consistent use and improved diagnostic capabilities.

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