Is it possible to completely disable the default C++ new operator?

Question

Because our app has hard performance and memory constraints, our coding standards forbid the use of the default heap — ie, no malloc, no default new

Answer 1

You can just declare operator new = delete, similar to how you'd disable some constructors. Like

struct Foo {
    void* operator new(std::size_t) = delete;
    void* operator new[](std::size_t) = delete;
};

That'll give you compiler errors when you try to use new with this class. See https://godbolt.org/z/RToOcf