HP aC++/HP C Programmer's Guide (B3901-90036; A.06.26; September 2011)

The equivalent, valid HP aC++ code follows:
void f(const int parm);
const int n = 3;
int main()
The for Statement, New Scoping Rules
In HP C++, variables declared in the initializer list are allowed after the for statement.
In the ANSI/ISO C++ International Standard, variables declared in the initializer list are
not allowed after the for statement. HP aC++ provides this functionality when you specify
the following aCC command-line option:
-WC,-ansi_for_scope,on
If you do not specify this option, (or you specify the -WC,-ansi_for_scope,off
option), by default, the new rules do not take effect.
In this scenario, HP aC++ provides this standard functionality as an option to ease
conversion of existing code to the standard. No code change is currently required.
Future plans are to make the ANSI/ISO C++ International Standard syntax the default.
HP recommends that you correct your code, by moving the declaration of the for loop
variable to its enclosing block.
Example:
The following code currently compiles without errors with HP C++ and HP aC++. In the
future, HP aC++, will generate an error.
int main(int argc) {
for (int i = 1; i < argc; ++i) {
}
for (i = 0; i < argc; ++i) {
}
}
Correct the code as follows:
int main(int argc) {
int i;
for (i = 1; i < argc; ++i) {
}
for (i = 0; i < argc; ++i) {
}
}
This code complies with ANSI/ISO C++ International Standard syntax and compiles
with both compilers.
struct as Template Type Parameter is Permitted
In HP C++, an error is generated when a struct is used as a template type parameter.
In HP aC++, when a struct is used as a template type parameter, it is correctly
compiled, in accordance with draft standard syntax. This is a new feature.
Migration Considerations Related to Standardization 265