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The concept Integrator_2 describes the set of requirements to be fulfilled by any function object used to instantiate the second template parameter of the class Stream_lines_2<VectorField_2,Integrator_2>. This concept provides the operation that integrates a new point from a given point with a predefined step, and according to a specified vector.
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The scalar type.
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The point type.
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The vector type.
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The vector field type.
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only a default constructor is needed.
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returns the new position from the actual position defined by p, according to the vector given by vector_field_2 at p.
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As above. The integration step is defined by integration_step.
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As above. In addition, this function integrates forward if direction is true, and backward if it is false.
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