C/C++ Programmer's Guide (G06.25+)

TNS C++ Implementation-Defined Behavior

HP C/C++ Programmer’s Guide for NonStop Systems—429301-008

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Interfacing to NonStop SQL/MP

Cfront does not support embedded SQL. Embedded SQL support is provided by

binding in C modules containing the desired SQL statements. Keep all SQL statements

in one or more separately compiled C modules and bind these C modules into the

executable C++ object file with Binder.

HP Specific Features for the Guardian

Environment

The HP specific features discussed in this subsection are applicable to only the

Guardian environment.

Mixed-Language Programming

Mixed-language programming in the HP environment comprises invoking a C, COBOL,

FORTRAN, Pascal, or TAL routine from your C++ program, or calling a C++ function

from one of these other languages. A function declaration must always precede any

invocation of that function.

For information on interfacing to other languages, refer to the discussion on mixed-

language programming in Section 7, Mixed-Language Programming for TNS

Programs, and in Section 8, Mixed-Language Programming for TNS/R and TNS/E

Native Programs.

To call a C++ function from another language, call the C++ function as if it were a C

function but use the encoded name form. Get this encoded name form from the C

source file that is created by Cfront.

If you want to call a function written in another language from a C or C++ program,

your program must have a C main function.

You do not need to put the extern C construct around #include <cextdecs>

because the extern C construct has already been added to the <cextdecs> header

file for use by C++.

System-Level Programming

C++ supports system-level programming. System-level programming refers to the

ability to write C++ functions that reside in system code, system library, or user library.

Refer to the Section 9, System-Level Programming.

Differences Between OSS and Guardian

Environments

The OSS and Guardian versions of Cfront each default to generate code that is

destined to run in their own environment. This subsection discusses how to target code