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Top Forums Programming stl map - could any one explain the o/p Post 302347806 by Corona688 on Wednesday 26th of August 2009 12:30:04 PM
Old 08-26-2009
You create an object with tst(), which is later destroyed.
A temporary copy of it is made for some reason when assigning it to the map, which is later destroyed.
Another copy is created to be stored inside the map, which is later destroyed, and with it, the object.

C++'s structure tends to the redundant copying of the copied copy copies sometimes, so this isn't too suprising.

Last edited by Corona688; 08-26-2009 at 02:42 PM..

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XkbCopyKeyTypes(3)						   XKB FUNCTIONS						XkbCopyKeyTypes(3)

XkbCopyKeyTypes - Copy more than one XkbKeyTypeRec structure SYNOPSIS
Status XkbCopyKeyTypes (XkbKeyTypePtr from, XkbKeyTypePtr into, int num_types); ARGUMENTS
- from pointer to array of XkbKeyTypeRecs to copy - into pointer to array of XkbKeyTypeRecs to change - num_types number of types to copy DESCRIPTION
XkbCopyKeyTypes copies num_types XkbKeyTypeRec structures from the array specified by from into the array specified by into. It is intended for copying between, rather than within, keyboard descriptions, so it doesn't check for overlaps. The same rules that apply to the from and into parameters in XkbCopyKeyType apply to each entry of the from and into arrays of XkbCopyKeyTypes. If any allocation errors occur while copying from to into, XkbCopyKeyTypes returns BadAlloc. Otherwise, XkbCopyKeyTypes copies from to into and returns Success. RETURN VALUES
Success The XkbCopyKeyTypes function returns Success when there are no allocation errors. STRUCTURES
Key types are used to determine the shift level of a key given the current state of the keyboard. The set of all possible key types for the Xkb keyboard description are held in the types field of the client map, whose total size is stored in size_types, and whose total number of valid entries is stored in num_types. Key types are defined using the following structure: typedef struct { /* Key Type */ XkbModsRec mods; /* modifiers used to compute shift level */ unsigned char num_levels; /* total # shift levels, do not modify directly */ unsigned char map_count; /* # entries in map, preserve (if non-NULL) */ XkbKTMapEntryPtr map; /* vector of modifiers for each shift level */ XkbModsPtr preserve; /* mods to preserve for corresponding map entry */ Atom name; /* name of key type */ Atom * level_names; /* array of names of each shift level */ } XkbKeyTypeRec, *XkbKeyTypePtr; DIAGNOSTICS
BadAlloc Unable to allocate storage SEE ALSO
XkbCopyKeyType(3) X Version 11 libX11 1.5.0 XkbCopyKeyTypes(3)

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