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Harriet Gecks, "Optimizing C++"

Introduction

The main reason to choose C++ as the software implementation language,

instead of simpler or higher-level languages, is the fact that this language

allows to build complex software that is more efficient than that built using

other programming languages. Please note that this language does not

guarantee automatically to build efficient software, but it only allows it.

Actually, when the same program is written sloppily in C++ and in higherlevel

languages, typically the C++ version is just as efficient as the one

developed in other languages.

Though, a good C++ programmer, by following guide-lines learned from

expert programmers, from its own experience, or from this book, is able, in

the first place, to write software that is already rather efficient since the first

cut, and then to optimize the resulting program, that is to improve

substantially the performance of the program by replacing some language

features with equivalent but faster features. Such optimization requires, first,

that the software source is written in a sufficiently modular way, to isolate

the performance critical parts, and then to use tools, libraries, knowledge,

and time, to change those parts in a way to increase the speed of the

resulting software.

Nowadays, many optimizing replacements are already performed by

compilers, and then they are no more programmers' burden. Though, present

compilers are not able to perform many other optimizations. This book

explains just such optimizations that can be performed by the programmers

but not by all present compilers.

This book is for persons that already know how to use the C++ language,

and that want to use it to develop high quality application software or

software libraries.

Almost all the optimization techniques presented are platform independent,

and therefore there will be few references to specific operating systems,

processor architectures, or compilers. Though, some of the presented

techniques come out to be ineffective or not applicable in some

combinations of operating system/processor/compiler.

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