42 lines
1.4 KiB
Text
42 lines
1.4 KiB
Text
.NH
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Particular details
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.NH 2
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Lower case/Upper case
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.PP
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Keywords must be either fully written in lower case or in upper case, thus
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\fBPAR\fP is equivalent to \fBpar\fP but \fBPar\fP is not a keyword. Identifiers
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may be of mixed case. Different styles are used in our examples just to indicate
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what's accepted by the compiler.
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.NH 2
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File inclusion
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.PP
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The C preprocessor is applied to the input file before
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compilation, so that files containing useful \fBPROC\fP and \fBDEF\fP
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declarations can be used in the program by using the \fB#include\fP-directive
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of the preprocessor.
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.NH 2
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Substitution
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.PP
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Named processes are not textually substituted. A procedure call is used instead.
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The semantics of occam substitution imply this by letting a global variable
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(i.e. not declared inside the named process' body) be found where the named
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process is defined and not where it is substituted.
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.NH 2
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ANY
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.PP
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According to the occam syntax the \fBANY\fP keyword may be the only argument of
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an input or output process. Thus,
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.DS
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.ft CW
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c ? ANY; x
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.ft
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.DE
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is not allowed. Because it was easy to add, and it was used by some programs,
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our compiler allows it. (If portability is an issue, usage of this feature
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is not advisable).
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.NH 2
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Configuration
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.PP
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The special configuration keywords like \fBPLACED\fP, \fBALLOCATE\fP, \fBPORT\fP
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and \fBLOAD\fP are not implemented. Only \fBPRI\fP works because \fBPAR\fP and
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\fBALT\fP work the same without it.
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