优化 - 返回过滤的元素作为std：vector＆lt; class＆gt;或std :: vector＆lt; Intrusive_ptr＆lt; class＆gt;＆gt;什么更好，为什么？

发布于 2025-02-04 18:14:34 字数 8 浏览 0 评论 0原文

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I have some doubts about optimization regarding storing elements in vectors and getting information from them. Lets see the example

struct Entity
{
public:
    Entity() = default;
    bool isActive = false;
    std::vector<SomeOtherClass> classesThatUseEntity;
}

class Manager
{
public:
Manager() = default;

const std::vector<Entity>& GetOnlyActiveEntity()
{
    std::vector<Entity> value;
    for (const auto& entity : differentSettings)
    {
        if (entity.isActive)
        {
            value.emplace_back();
        }
    }

    return value;
}
private:
std::vector<Entity> differentSettings;

}

I was thinking of maybe using a vector of pointers to return values:
std::vector< boost::intrusive_ptr<Entity>> GetOnlyActiveEntity()
with this, I got some comments from colleagues that the vector of pointers, in this case, is not the smart option because of heap fragmentation, but I am not sure that this comment is legit. What do you think?

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