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Manually deleting a pointer returned by function


Manually deleting a pointer returned by function

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Manually deleting a pointer returned by function
Tag : cpp , By : cjdavis
Date : November 25 2020, 01:01 AM


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Does deleting dynamically allocated std::string using a pointer returned by c_str() cause a memory leak in C++?


Tag : cpp , By : vitorcoliveira
Date : March 29 2020, 07:55 AM
this one helps. "Will this delete the string ?"
No. It will try to delete std::string's underlying character storage yielding an undefined behavior.

How do I dereference the address returned by a pointer from a function that takes an int & a pointer of type struct?


Tag : cpp , By : dnyaneshwar
Date : March 29 2020, 07:55 AM
I wish this helpful for you I am passing an int & a pointer to a struct into a function that returns a pointer to data in the struct. How do I dereference the address returned by the pointer? , Try:
cout << "The number you searched for is: " << found->number;
cout << "The number you searched for is: " << (*found).number;

How to correctly assign a pointer returned by dlsym into a variable of function pointer type?


Tag : c , By : user169463
Date : March 29 2020, 07:55 AM
wish of those help If you want to be pedantically correct, don't try to resolve the address of a function. Instead, export some kind of structure from the dynamic library:
In the library
struct export_vtable {
   void (*helloworld)(void);
};
struct export_vtable exports = { func };
struct export_vtable {
   void (*helloworld)(void);
};

int main() {
   struct export_vtable* imports;
   void *handle = dlopen("./foo.so", RTLD_NOW);

   if (handle) {
        imports = dlsym(handle, "exports");
        if (imports) imports->helloworld();
    }

    return 0;
}

Deleting a pointer returned from a function?


Tag : cpp , By : Tetting
Date : March 29 2020, 07:55 AM
wish helps you I'm writing doing a coding assignment for school that requires us to use arrays instead of vectors (the point is to learn about pointers and memory management). The issue I'm having is that I'm unable to delete a pointer returned from a function -- below is an example of what I'm talking about. , There are two mistakes in:
int* rndFunc(){
    int *rndValue = new int[5]; // instead of int *rndValue = new *int[5];

    return rndValue; // Instead of return bar;
}

Function not found after manually deleting a function in a SAM CloudFormation stack


Tag : amazon-web-services , By : hsdfhksh
Date : March 29 2020, 07:55 AM
I hope this helps . I guess you already learnt the hard way that you should never manually delete resources managed by SAM or CloudFormation.
In general, if you just want to change the function, you can just call sam build and sam deploy, and the new version of it will be deployed. There is no need to delete anything. If you need a more advanced workflow, you will need to read blog posts. There is no one right way to do this.
▶ aws cloudformation get-template --stack-name HelloWorld \
    --template-stage Processed --query TemplateBody | cfn-flip -y > processed.yml
▶ aws cloudformation validate-template --template-body file://processed.yml
{
    "CapabilitiesReason": "The following resource(s) require capabilities: [AWS::IAM::Role]",                                                                         
    "Description": "sam-app\nSample SAM Template for sam-app\n",
    "Parameters": [],
    "Capabilities": [
        "CAPABILITY_IAM"
    ]
}
▶ aws cloudformation update-stack --template-body file://processed.yml --stack-name HelloWorld --capabilities CAPABILITY_IAM                        
{
    "StackId": "arn:aws:cloudformation:ap-southeast-2:885164491973:stack/HelloWorld/af2c6810-7884-11e9-9bb3-068b1a8e1450"
}
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