Chapter 5. General Language Features of M

Revision History
Revision V6.0-001	21 March 2013	In “Numeric Relational Operators”, added <= and >= as new operators. In “Indirection Concerns”, added a note on the handling of run-time errors.
Revision V5.5-000/2	31 October 2012	Corrected the reference to the gtm_tprestart_log_delta and gtm_tprestart_log_first environment variables in “TP Performance”.
Revision V5.5-000/1	05 October 2012	Improved the description of “TP Characteristics” and added the guidelines for implementing Web Services safely on GT.M.
Revision V5.4-002B	26 December 2011	Conversion to documentation revision history reflecting GT.M releases with revision history for each chapter.

Contents

Data Types

Numeric Expressions
Numeric Accuracy
Integer Expressions
Truth-valued Expressions

M Names

Variables

Arrays and Subscripts
M Collation Sequences
Local Variables
Global Variables and Resource Name Environments
Naked References
Global Variable Name Environments

Literals

String Literals
Numeric Literals

Expressions

Operators

Precedence
Arithmetic Operators
Logical Operators
String Operators
Numeric Relational Operators
String Relational Operators
Pattern Match Operator

Commands

Postconditionals
Timeouts

M Locks

Intrinsic Functions

Intrinsic Special Variables

Routines

Lines
Entry References
Label References

Indirection

Argument Indirection
Atomic Indirection
Entryref Indirection
Pattern Code Indirection
Name Indirection
Indirection Concerns

Parameter Passing

Actuallists
Actualnames
Formallists
Formallabel
Parameter Passing Operation
Parameter Passing Mechanisms
GT.M Parameter Passing Extensions

External Calls

Extrinsic Functions

Extrinsic Special Variables

Transaction Processing

TP Definitions
TP Characteristics
TP Performance
TP Example

This chapter describes general features of the M language, as well as general information about the operation of GT.M. Commands, Functions, and Intrinsic Special Variables are each described in separate chapters. This chapter contains information about exceptions, as well as information about general M features.

MUMPS is a general purpose language with an embedded database system. This section describes the features of the language that are not covered as Commands, Functions, or Intrinsic Special Variables chapters.

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