How do I find an element position in std::vector?

Take a look at the answers provided for this question: Invalid value for size_t?. Also you can use std::find_if with std::distance to get the index. std::vector<type>::iterator iter = std::find_if(vec.begin(), vec.end(), comparisonFunc); size_t index = std::distance(vec.begin(), iter); if(index == vec.size()) { //invalid }

Building a web search engine [closed]

There are several parts to a search engine. Broadly speaking, in a hopelessly general manner (folks, feel free to edit if you feel you can add better descriptions, links, etc): The crawler. This is the part that goes through the web, grabs the pages, and stores information about them into some central data store. In … Read more

Paging Library Filter/Search

You can solve this with a MediatorLiveData. Specifically Transformations.switchMap. // original code, improved later public void reloadTasks() { if(liveResults != null) { liveResults.removeObserver(this); } liveResults = getFilteredResults(); liveResults.observeForever(this); } But if you think about it, you should be able to solve this without use of observeForever, especially if we consider that switchMap is also doing … Read more

Good C string library [closed]

It’s an old question, I hope you have already found a useful one. In case you didn’t, please check out the Simple Dynamic String library on github. I copy&paste the author’s description here: SDS is a string library for C designed to augment the limited libc string handling functionalities by adding heap allocated strings that … Read more

Difference between BooleanClause.Occur.Must and BooleanClause.Occur.SHOULD in lucene

BooleanClause.Occur.SHOULD means that the clause is optional, whereas BooleanClause.Occur.Must means that the clause is compulsory. However, if a boolean query only has optional clauses, at least one clause must match for a document to appear in the results. For better control over what documents match a BooleanQuery, there is also a minimumShouldMatch parameter which lets … Read more

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