Class SubListGenerator

tests/deprecated/test_utilities.cpp:1554–1653

@private

/// @private
class SubListGenerator : public Catch::Generators::IGenerator<int*> {
    int* list;
    int* sublist;
    int len;
    int sublen;
    vector<bool> featured;
private:
    void createSublist() {
        
        // sublist to send to the user
        sublist = (int*) malloc(sublen * sizeof *sublist);
        
        // indicates which list members are currently in sublist
        featured = vector<bool>(len);
        fill(featured.end() - sublen, featured.end(), true);   
    }
    
    void prepareSublist() {
        
        // choose the next combination
        int j=0;
        for (int i=0; i<len; i++)
            if (featured[i])
                sublist[j++] = list[i];
                
        // prepare for permuting
        std::sort(sublist, sublist+sublen);
    }
public:
    SubListGenerator(int* elems, int numElems, int numSamps) {
        
        DEMAND( numSamps <= numElems );
                
        // make a record of all elements
        len = numElems;
        list = (int*) malloc(len * sizeof *list);
        for (int i=0; i<len; i++)
            list[i] = elems[i];
        
        // prepare sublist
        sublen = numSamps;
        createSublist();
        prepareSublist();  
    }
    
    SubListGenerator(
        Catch::Generators::GeneratorWrapper<int>&& gen, 
        int numSamps, const int* exclude, int numExclude
    ) {    
        // extract all generator elems
        vector<int> elems = vector<int>();
        do { elems.push_back(gen.get()); } while (gen.next());
        
        // make (int*) of non-excluded elems
        len = 0;
        list = (int*) malloc(elems.size() * sizeof *list);
        for (size_t i=0; i<elems.size(); i++) {
            int elem = elems[i];