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When an array is allocated, each object s constructor is automatically called. When an array is freed, each object s destructor is automatically called. You do not have to provide explicit code to accomplish these actions. The new and delete operators are generally overloaded relative to a class. For the sake of simplicity, in the example that follows, no new allocation scheme will be used. Instead, the overloaded functions will simply invoke the C-based allocation functions malloc( ) and free( ). (In your own application, you are, of course, free to implement any alternative allocation method you like.) To overload the new and delete operators relative to a class, simply make the overloaded operator functions class members. In the following sample program, the new and delete operators are overloaded relative to the three_d class. Both are overloaded to allow objects and arrays of objects to be allocated and freed.

second type of converter exists. Thus, in the remainder of this chapter we will compare and contrast the use of the two types of fiber-optic converters. The converter described in this section represents an optical mode converter. As discussed in this section, this type of converter converts single-mode fiber to multimode and vice versa, and the rationale for its use is its ability to drive the optical signal a sufficient distance beyond the direct use of a particular medium. If we remember our discussion of fiber-optic converters in 5, we noted that they converted an electrical signal into an optical signal. However, we also noted that their primary role was as a mechanism to extend transmission distance. Thus, the primary difference between the optical mode converter discussed in this section and the media converter discussed in 5 concerns their interfaces. The mode converter has dual optical interfaces, while the media converter has one electrical interface and one optical interface. However, both types of communications devices are similar in that the primary rationale for their use is to extend transmission distance.

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Passive Optical Networks (PONs)

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of an FRP superstructure: i.e., 1 inch for each foot of span. If desired, a slimmer section can be obtained by asking the manufacturer to engineer the fabric architecture accordingly. 6. Speci c design criteria are: To avoid long term creep, predicted strains under design load shall be less than 20 percent of the FRP composite's minimum guaranteed ultimate strength. The ultimate strength is based on coupon testing and is noted in the approved plans. An environmental durability factor (knock down factor) of 0.65 may be applied to the material properties to account for degradation of properties over time. Because of the material's typical low modulus of elasticity, most designs will be driven by de ection limitations and not strength requirements. Although the criterion for de ection is somewhat arbitrary, it is typically kept at 1/800 of the supporting span length. 7. Research is required in the areas of long-term environmental effects on FRP: In identifying the various failure modes of FRP composites In developing design methodologies To develop ef cient connections to utilize the advantageous properties of FRP composite sections.

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