HP aC++/HP C A.06.25 Programmer's Guide

to an HP aC++ program. In addition to keyword changes, there are changes in C++

Semantics and C++ Syntax.

Changes in C++ Semantics

Following lists the differences in code behavior when you migrate from HP C++ to HP

aC++:

• Implicit Typing of Character String Literals

• Overload Resolution Ambiguity of Subscripting Operator

• Execution Order of Static Constructors in Shared Libraries

• More Frequent Inlining of Inline Code

NOTE: These differences can occur inspite of compiling your code without errors.

Implicit Typing of Character String Literals

HP C++ implicitly types character string literals as char *. HP aC++, in accordance

with the ANSI/ISO C++ International Standard, types character string literals as

const char *. This difference affects function overloading resolution.

Example:

In the following code, HP aC++ calls the first function a; cfront calls the second.

void a(const char *);

void a(char *);

f() {

a(“A_STRING”);

}

To prevent existing code from breaking, assign a string literal to a non-const pointer.

Example:

char *p = “B_STRING”;

NOTE: This feature may not be a part of the Standard in future revisions.

Also, you cannot convert const char * to char *in a conditional expression in this

context.

Example:

char *p = f() ? “A” : “B”;

In such a scenario, you must change the code.

Example:

const char *p = f() ? “A” : “B”;

char *p = const_cast(f() ? “A” : “B”);

Migration Considerations Related to Standardization 275