59 lines
2.7 KiB
Plaintext
59 lines
2.7 KiB
Plaintext
% Copyright 2005-2016 Cisco Systems, Inc.
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%
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% Licensed under the Apache License, Version 2.0 (the "License");
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% you may not use this file except in compliance with the License.
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% You may obtain a copy of the License at
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%
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% http://www.apache.org/licenses/LICENSE-2.0
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%
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% Unless required by applicable law or agreed to in writing, software
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% distributed under the License is distributed on an "AS IS" BASIS,
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% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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% See the License for the specific language governing permissions and
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% limitations under the License.
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\chapter{Preface}
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{\ChezScheme} Version~9 is a complete implementation of the language of
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the Revised$^6$ Report on Scheme (R6RS), with numerous extensions.
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The implementation is extensively tested and actively maintained and supported.
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It includes a fast compiler that generates efficient native code for each
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processor upon which it runs along with a run-time system that provides
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automatic storage management, foreign language interfaces, and an
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extensive run-time library.
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The compiler has been rewritten for Version~9 and generates
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substantially faster code than the earlier compiler at the cost of
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additional compile time.
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This is the primary difference between Versions~8 and~9.
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This book is a companion to \emph{The Scheme Programming Language, 4th
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Edition} (TSPL4).
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While TSPL4 describes only standard R6RS features, this book describes
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{\ChezScheme} extensions.
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For the reader's convenience, the summary of forms and index at the back
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of this book contain entries from both books, with each entry from TSPL4
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marked with a ``t'' in front of its page number.
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In the online version, the page numbers given in the summary of forms and
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index double as direct links into one of the documents or the other.
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Additional documentation for {\ChezScheme} includes release notes, a
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manual page, and a number of published papers and articles that describe
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various aspects of the system's design and implementation.
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The threaded versions of {\ChezScheme} support native threads, allowing
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Scheme programs to take advantage of multiprocessor or multiple-core
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systems.
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Nonthreaded versions are also available and are faster for
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single-threaded applications.
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Both 32-bit and 64-bit versions are available for some platforms.
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The 64-bit versions support larger heaps, while the 32-bit versions
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are faster for some applications.
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{\ChezScheme}'s interactive programming system includes an expression
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editor that, like many shells, supports command-line editing, a history
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mechanism, and command completion.
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Unlike most shells that support command-line editing, the expression
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editor properly supports multiline expressions.
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Thank you for using {\ChezScheme}.
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