c++: how to return a shared_ptr from function

问题

when trying to return a shared_ptr from a function I get: reference to local variable 'recipe' returned [-Werror=return-local-addr]

where did I go wrong ?

shared_ptr<Recipe>& Group::addRecipe(const string& groupName, unsigned int autherId, const string& recipeName){

    shared_ptr<Recipe> recipe(new Recipe(recipeName, autherId));

    recipes.push_back(recipe);
    return recipe;
}

what is the right way to return a shared_ptr ?

回答1:

The function's signature isn't shown, but it sounds like it's probably returning shared_ptr<Recipe>&. Returning a reference to a temporary is a big no-no since the referenced object will be destroyed as soon as the function exits. Just return by value instead.

来源：https://stackoverflow.com/questions/24440613/c-how-to-return-a-shared-ptr-from-function