Understanding C++ Expression Templates - Angelika Langer
Understanding C++ Expression Templates - Angelika Langer
Understanding C++ Expression Templates - Angelika Langer
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37Run-Time vs. Compile-Time DispatchInheritance-based polymorphism (OOP) can be replaced bytemplates (GP = generic programming).Overhead:– GP: code bloat & compile-time overhead– OOP: run-time overheadConformance to an interface:– GP: common names– OOP: a common base classIntegration of built-in types:– GP: overloaded operators native operatorsfunction objects function pointers– OOP: not possible© Copyright 1995-2000 by <strong>Angelika</strong> <strong>Langer</strong>. All Rights Reserved.http://www.<strong>Angelika</strong><strong>Langer</strong>.com(73)last update: 11/7/2005 ,21:37! compile-time computation of constant values– factorial– square root! compile-time evaluation of expressions– dot product– arithmetic expression! more examples of modern template programming– compile-time polymorphism– policy classes– template meta-programmingAgenda© Copyright 1995-2000 by <strong>Angelika</strong> <strong>Langer</strong>. All Rights Reserved.http://www.<strong>Angelika</strong><strong>Langer</strong>.com(74)last update: 11/7/2005 ,21:37
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