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// utilities.h
	template <typename Generator>
	double randomDoubleEngine(Generator& engine, double low_bound, double high_bound )
	{
		if (low_bound > high_bound){
			std::swap(low_bound, high_bound);
		}
 
		return std::uniform_real_distribution<>( low_bound, high_bound )( engine );
	}
 
	template < typename Generator = std::mt19937, typename Distribution = std::uniform_real_distribution<double>, typename T = double >
	struct randGen
	{
		randGen(const Generator & eng, T low, T high) : m_engine(eng),  m_distribution(low, high) {}
		T operator()() { return m_distribution(m_engine); }
 
	  private:
 
		Generator m_engine;
		Distribution m_distribution;
	};
 
// myclass.cpp	
	void myclass::doSomething1(param1, param2, ...){
 
		std::random_device rd;
		static std::mt19937 engine(rd());
 
		for (i=0; i < someLimit; i++){
			Compute interval [treshmin, threshmax]
 
			for(int j=0; j < numIter; j++){
				randThreshold = randomDoubleEngine(engine, treshmin, treshmax ); // <------------------
				....
			}
		}
	}
 
	void myclass::doSomething2(param1, param2, ...){
 
		std::random_device rd;
		static std::mt19937 engine(rd());
 
		for (i=0; i < someLimit; i++){
			Compute interval [treshmin, threshmax]
 
			randGen<std::mt19937, std::uniform_real_distribution<double>, double > myRandGen( engine, treshmin,  treshmax );
 
			for(int j=0; j < numIter; j++){
				randThreshold = myRandGen(); // <------------------
				....
			}
		}
	}
 
	void myclass::doSomething3(param1, param2, ...){
 
		std::random_device rd;
		std::mt19937 engine(rd());
 
		for (i=0; i < someLimit; i++){
			Compute interval [treshmin, threshmax]
 
			randGen<std::mt19937, std::uniform_real_distribution<double>, double > myRandGen( engine, treshmin,  treshmax );
 
			for(int j=0; j < numIter; j++){
				randThreshold = myRandGen(); // <------------------
				....
			}
		}
	}

prog.cpp: In function 'double randomDoubleEngine(Generator&, double, double)':
prog.cpp:6:4: error: 'swap' is not a member of 'std'
prog.cpp:9:10: error: 'uniform_real_distribution' is not a member of 'std'
prog.cpp:9:41: error: expected primary-expression before '>' token
prog.cpp: At global scope:
prog.cpp:12:34: error: expected type-specifier
prog.cpp:12:34: error: expected '>'
prog.cpp:15:34: error: 'T' has not been declared
prog.cpp:15:41: error: 'T' has not been declared
prog.cpp:16:3: error: 'T' does not name a type
prog.cpp:21:3: error: 'Distribution' does not name a type
prog.cpp: In constructor 'randGen<Generator>::randGen(const Generator&, int, int)':
prog.cpp:15:67: error: class 'randGen<Generator>' does not have any field named 'm_distribution'
prog.cpp: At global scope:
prog.cpp:25:7: error: 'myclass' has not been declared
prog.cpp:25:29: error: variable or field 'doSomething1' declared void
prog.cpp:25:29: error: 'param1' was not declared in this scope
prog.cpp:25:37: error: 'param2' was not declared in this scope
prog.cpp:25:45: error: expected primary-expression before '...' token

Standard output is empty