HP gnu source-level debugger 5992-4701 manual C++

9.4.1 C and C++

Since C and C++ are so closely related, many features of GDB apply to both languages. Whenever this is the case, we discuss those languages together.

The C++ debugging facilities are jointly implemented by the C++ compiler and GDB. Therefore, to debug your C++ code effectively, you must compile your C++ programs with a supported C++ compiler, such as GNU g++, or the HP ANSI C++ compiler (aCC).

For best results when using GNU C++, use the stabs debugging format. You can select that format explicitly with the g++ command-line options '-gstabs' or '-gstabs+'. Refer to section “Options for Debugging Your Program or GNU CC” in Using GNU CC, for more information.

9.4.1.1 C and C++ operators

Operators must be defined on values of specific types. For instance, + is defined on numbers, but not on structures. Operators are often defined on groups of types.

For the purposes of C and C++, the following definitions hold:

•Integral types include int with any of its storage-class specifiers; char; enum; and, for C++, bool.

•Floating-point types include float, double, and long double (if supported by the target platform).

•Pointer types include all types defined as (type *).

•Scalar types include all of the above.

The following operators are supported. They are listed here in order of increasing precedence:

,	The comma or sequencing operator. Expressions in a
	comma-separated list are evaluated from left to right, with the
	result of the entire expression being the last expression evaluated.
=	Assignment. The value of an assignment expression is the value
	assigned. Defined on scalar types.
op=	Used in an expression of the form a op= b, and translated to a = a
	op b. op= and = have the same precedence. op is any one of the
	operators , ^, &, <<, >>, +, -, *, /, %.
?:	The ternary operator. a ? b : c can be thought of as: if a then b else
	c. a should be of an integral type.
	Logical OR. Defined on integral types.
&&	Logical AND. Defined on integral types.
	Bitwise OR. Defined on integral types.
^	Bitwise exclusive-OR. Defined on integral types.
&	Bitwise AND. Defined on integral types.

106 Using GDB with Different Languages