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CHAPTER 6 USING GLIB
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Arrays
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There are three types of array data types provided by GLib, which are used to store pointers, bytes, or arbitrary types of data. There are multiple advantages of using arrays in GLib. First, they provide very fast memory access, because direct indexing is supported. This is because of the fact that the GArray structure holds data in an internal array. Another advantage of GLib array types is that they will automatically expand in size if a new element will not fit. However, you do need to keep in mind that every time you change the number of elements in the array, it can call g_memmove() and memcpy(), which can be expensive if you do this too often. Therefore, GLib arrays are not optimal for applications that will need to constantly add and remove elements.
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Each of the three types of arrays provided by GLib has similar APIs. Therefore, only GArray will be covered in detail. For more information on GPtrArray and GByteArray, you should supplement the instructions given in this section with the API documentation of each data type. The GArray structure contains two public members: a pointer to the element data stored by the array and the current length of the array in elements. You should note that, as you change change the number of elements stored by the array, data might not stay in a constant position. Therefore, you should not make a permanent reference to this pointer. Also, every element in the array must always be the same length. typedef struct { gchar *data; guint len; } GArray; GLib provides two functions for creating a new GArray. g_array_sized_new() allows you to create an array with an initial number of elements (reserved_size) already allocated. This allows you to avoid reallocating the array too many times. GArray* g_array_sized_new (gboolean zero_terminated, gboolean set_to_zero, guint element_size guint reserved_size); If you set zero_terminated to TRUE, one extra element will be added to the array where every bit is set to zero. Setting set_to_zero to TRUE will clear all bits in the array to zero when allocated. You also need to specify the size that every element will be allocated. Every element must always have a size that is less than or equal to element_size. Alternatively, you can create a new GArray with g_array_new(), which simply calls g_array_sized_new() with an initial allocated size of zero elements. You should only use this initialization function if the array will not be adding too many elements to the array, because adding a large number of elements will cause it to be reallocated many times. GArray* g_array_new (gboolean zero_terminated, gboolean set_to_zero, guint element_size);
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CHAPTER 6 USING GLIB
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In order to append multiple new elements to a GArray, you should call g_array_append_vals(). This function will add len number of elements out of data to the end of the array. If you need to append one element to the array, you can use g_array_append_val(). It is defined by the following macro, so there is no difference between calling this function and g_array_append_vals() with a length of 1. GArray* g_array_append_vals (GArray *array, gconstpointer data, guint len);
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Caution You cannot add literal values such as 13 to a GArray with g_array_append_val(), because
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it references the value parameter. You must always use variables when adding elements to an array!
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In addition to appending values, GLib provides function for prepending and inserting a single value or multiple values in the same way as g_array_append_val() and g_array_append_vals(). #define g_array_append_val(a,v) g_array_append_vals (a, &(v), 1) You can remove an element with the given index with g_array_remove_index(). This function will then shift all of the elements that are located after the removed element one place forward. You should then store the new location of the GArray object. GArray* g_array_remove_index (GArray *array, guint index); You can also use g_array_remove_index_fast(), which will shift the last element into the position of the removed element. This is considerably faster than g_array_remove_index(), but it will not preserve the order of the array. Therefore, it may not always be the optimal solution. If you need to remove a block of elements in one call, you should use g_array_remove_range(). This function will remove length elements beginning at index and shift the following elements into the empty spaces. You should use this function when removing elements if possible, because it will require far fewer memory shifts than g_array_remove_index(). GArray* g_array_remove_range (GArray *array, guint index); guint length); When using GArray, you will most likely need to access elements by their index. One advantage of this data structure is that indexing is performed very quickly, since elements are evenly sized. You can index an element with g_array_index(), which accepts the GArray object, the data type that will be used to cast the return value, and the element index. The returned value will automatically be cast to the data type you provided to the second parameter. As with other data types in GLib, you are able to sort a GArray with g_array_sort(). This function accepts a standard GCompareFunc callback that is used to compare two elements. In addition, you can use g_array_sort_data(), which allows you to send an additional pointer data parameter to the comparison function.
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