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In addition to the basic data types, GLib provides a number of predefined values and standard macros that you can use throughout your applications. While most applications will not make wide use of every macro, they are here to make your life easier. For instance, there are macros for checking the GLib version and various type conversions.
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CHAPTER 6 USING GLIB
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At times, you may want to check the user s version of GLib to decide whether or not to compile a certain feature. GLib provides version information for use during compile time and runtime, shown in Table 6-2. Table 6-2. GLib Version Information
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Value
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GLIB_MAJOR_VERSION
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The major version of the GLib headers that is included. To get the major version of the library that you linked against, you can use glib_major_version. In GLib 2.12.1, 2 indicates the major version. The minor version of the GLib headers that is included. To get the minor version of the library that you linked against, you can use glib_minor_version. In GLib 2.12.1, 12 indicates the minor version. The micro version of the GLib headers that is included. To get the micro version of the library that you linked against, you can use glib_micro_version. In GLib 2.12.1, 1 indicates the micro version. Returns TRUE if the version of the GLib header files that you are using is the same or a newer version than specified. You can use this to make sure that the user has a compatible version of GLib when compiling a specific feature.
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GLIB_MINOR_VERSION
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GLIB_MICRO_VERSION
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GLIB_CHECK_VERSION (major, minor, micro)
In addition to the version information presented in Table 6-2, you can also use glib_check_version() to check the version of GLib currently in use at runtime. This function returns NULL, if the library is compatible, or a string that gives more information about the incompatibility. This function makes sure that the runtime version is the same or a more recent release. const gchar* glib_check_version (guint major, guint minor, guint micro); GLib also provides a number of additional macros that do everything from numerical operations, type conversions, and memory referencing to simply defining Boolean values for TRUE and FALSE. A list of some of the most useful macros can be found in Table 6-3. Table 6-3. Standard GLib Macros
Macro
ABS (a)
Description
Return the absolute value of argument a. This function simply returns any negative number without the negative sign and does nothing to positive numbers. Make sure that a is between low and high. If a is not between low and high, the returned value will be the closest of the two. Otherwise, the returned value will be left unchanged. On UNIX machines, directories are separated by a slash (/), and on Windows machines, they are separated by a backslash (\). G_DIR_SEPARATOR will return the appropriate separator as a character, and G_DIR_SEPARATOR_S will return the separator as a string.
CLAMP (a, low, high)
G_DIR_SEPARATOR G_DIR_SEPARATOR_S
CHAPTER 6 USING GLIB
Macro
GINT_TO_POINTER (i) GPOINTER_TO_INT (p)
Description
Convert an integer to a gpointer or a gpointer to an integer. Only 32 bits of the integer will be stored, so you should avoid using integers that will take up more than that amount of space when using these macros. Remember that you cannot store pointers in integers. This only allows you to store an integer as a pointer. Convert a gsize value to a gpointer or a gpointer to gsize value. The gsize data type must have been stored as a pointer with GSIZE_TO_POINTER() to convert it back. See GINT_TO_POINTER() for more information. Convert an unsigned integer to a gpointer or a gpointer to an unsigned integer. The integer must have been stored as a pointer with GUINT_TO_POINTER() to convert it back. See GINT_TO_POINTER() for more information. These three macros allow you to define code that will only be run on a specific platform. Only the macro corresponding to the user s system will be defined, so you can bracket code specific to the user s operating system with #ifdef G_OS_*. Returns the member of the structure located at the specified offset. This offset must be within struct_p. type defines the data type of the field you are retrieving. Returns an untyped pointer to the member of the structure located at the specified offset. The offset must be within struct_p. Returns the byte offset of a member within a structure. The structure type is defined by type. Calculates the minimum or maximum value of the two arguments a and b respectively. FALSE is defined as zero, and TRUE is set to the logical not of FALSE. These values are used for the gboolean type.
GSIZE_TO_POINTER (s) GPOINTER_TO_SIZE (p)
GUINT_TO_POINTER (u) GPOINTER_TO_UINT (p)
G_OS_WIN32 G_OS_BEOS G_OS_UNIX G_STRUCT_MEMBER (type, struct_p, offset) G_STRUCT_MEMBER_P (struct_p, offset) G_STRUCT_OFFSET (type, member) MIN (a, b) MAX (a, b) TRUE and FALSE
GLib also provides a number of macros for standard mathematical units, with precision up to 50 decimal places in some cases. Those included in GLib 2.12 follow: G_E: The base of the natural logarithm with a precision of 49 decimal places G_LN2: The natural logarithm of 2 with a precision of 50 decimal places G_LN10: The natural logarithm of 10 with a precision of 49 decimal places G_PI: The value of pi with a precision of 49 decimal places G_PI_2: The value of pi divided by 2 with a precision of 49 decimal places G_PI_4: The value of pi divided by 4 with a precision of 50 decimal places G_SQRT2: The square root of 2 with a precision of 49 decimal places G_LOG_2_BASE_10: The logarithm of 2 with base 10 with a precision of 20 decimal places
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