std::unique pointer and custom lambda deleter error

Question

I am trying to use a std::unique_pointer and supply a custom lambda deleter with it, but I am getting syntax error: ``` cannot convert from 'wmain::' to 'const std::default_delete<_Ty>' ``` with the following simple, minimal code: ``` #include class TestClass { }; typedef std::unique_ptr TestClassPtr; int _tmain(int argc, _TCHAR* argv[]) { TestClassPtr testPtr(new TestClass(), [](TestClass* w){ delete w;}); return 0; } ``` Is this the wrong way to supply a lambda deleter to a smart pointer?

Accepted Answer

The deleter must be part of the `unique_ptr`'s type.

```
typedef std::unique_ptr<TestClass, void(*)(TestClass *)> TestClassPtr;
```

Your code should work after you make this change. Also, I'm assuming you're going to do something other than simply call `delete` on the pointer within the deleter. If not, there's no need to supply a custom deleter.

std::unique pointer and custom lambda deleter error

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