Recherche de tag: singleton

#include <string>

class rev_comp
{
public:
    static std::string run(std::string seq)
    {
	rev_comp::build_instance();
	
	auto first = seq.begin(), last = seq.end();
        
	while(true)
        {
		if(first == last || first == --last)
        	{
        	    if(seq.length() % 2)
        		    *first = rev_comp::complement[*first];
        	    return seq;
        	}
        	else
        	{
        	    *first = rev_comp::complement[*first];
        	    *last = rev_comp::complement[*last];
        	    std::iter_swap(first, last);
        	    ++first;
            }
        }
    }

protected:
    static rev_comp* _instance;
    static void build_instance()
    {
        if(_instance == nullptr)
            _instance = new rev_comp();
    }
    
    rev_comp()
    {
        this->complement['A'] = 'T';
        this->complement['T'] = 'A';
        this->complement['C'] = 'G';
        this->complement['G'] = 'C';
        this->complement['a'] = 't';
        this->complement['t'] = 'a';
        this->complement['c'] = 'g';
        this->complement['g'] = 'c';
    }
        
    ~rev_comp(){}
    
    
private:
    static char complement['t' + 1];
};

char rev_comp::complement['t' + 1];
rev_comp* rev_comp::_instance = nullptr;