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#include <iostream>
#include <vector>
 
class SplitFunction {
  public:
    SplitFunction(int x, int y, double t) : this->x(x),
                                            this->y(y),
                                            this->t(t) { }
    bool operator()(std::vector<double> f) {
      return (f[x] - f[y]) < t;
    }
  private:
    int x, y;
    double t;
};
 
int main() {
	SplitFunction s(1, 2, 3);
	return 0;
}

prog.cpp: In constructor ‘SplitFunction::SplitFunction(int, int, double)’:
prog.cpp:6:45: error: expected identifier before ‘this’
     SplitFunction(int x, int y, double t) : this->x(x),
                                             ^
prog.cpp:6:45: error: expected ‘{’ before ‘this’

Standard output is empty