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c++ Programming Glossary: paddingWhy isn't sizeof for a struct equal to the sum of sizeof of each member? http://stackoverflow.com/questions/119123/why-isnt-sizeof-for-a-struct-equal-to-the-sum-of-sizeof-of-each-member settings for an x86 processor struct X short s 2 bytes 2 padding bytes int i 4 bytes char c 1 byte 3 padding bytes struct Y.. s 2 bytes 2 padding bytes int i 4 bytes char c 1 byte 3 padding bytes struct Y int i 4 bytes char c 1 byte 1 padding byte short.. 3 padding bytes struct Y int i 4 bytes char c 1 byte 1 padding byte short s 2 bytes struct Z int i 4 bytes short s 2 bytes..
http://stackoverflow.com/questions/1604968/what-does-this-c-code-mean bit field ™s type in such cases the extra bits are used as padding bits and do not participate in the value representation 3.9.. be initialized. Note an unnamed bit field is useful for padding to conform to externally imposed layouts. end note As a special..
casting via void* instead of using reinterpret_cast http://stackoverflow.com/questions/1863069/casting-via-void-instead-of-using-reinterpret-cast and vice versa. Note There might therefore be unnamed padding within a POD struct object but not at its beginning as necessary..
Why does this program crash: passing of std::string between DLLs http://stackoverflow.com/questions/2322095/why-does-this-program-crash-passing-of-stdstring-between-dlls 32 in a debug build and 28 in a release build this isn't padding 28 and 32 are both 4 byte boundaries . So what's happening Variable..
Does the size of an int depend on the compiler and/or processor? http://stackoverflow.com/questions/2331751/does-the-size-of-an-int-depend-on-the-compiler-and-or-processor occupies 128 bits of memory using the other 57 bits as padding bits that are always required to store the birthdate of the..
Do class/struct members always get created in memory in the order they were declared? http://stackoverflow.com/questions/281045/do-class-struct-members-always-get-created-in-memory-in-the-order-they-were-decl they are declared. and goes on to say a bit more about padding and addresses. The C89 equivalent section is §6.5.2.1. C is..
http://stackoverflow.com/questions/3318410/pragma-pack-effect Most compilers when you declare a struct will insert padding between members to ensure that they are aligned to appropriate.. like this Bytes 1 2 3 4 5 6 7 8 9 10 11 12 Member one padding two three padding and sizeof Test would be 12 even though it.. 1 2 3 4 5 6 7 8 9 10 11 12 Member one padding two three padding and sizeof Test would be 12 even though it only contains 6 bytes..
Determining the alignment of C/C++ structures in relation to its members http://stackoverflow.com/questions/364483/determining-the-alignment-of-c-c-structures-in-relation-to-its-members in the standard Structures are allowed to have padding between their members and at the end Arrays are not allowed.. members and at the end Arrays are not allowed to have padding between their elements You can create an array of any structure..
Using arrays or std::vectors in C++, what's the performance gap? http://stackoverflow.com/questions/381621/using-arrays-or-stdvectors-in-c-whats-the-performance-gap a x86_64 suse linux machine. #include vector struct S int padding std vector int v int p std vector int iterator i int pointer_index..
What are Aggregates and PODs and how/why are they special? http://stackoverflow.com/questions/4178175/what-are-aggregates-and-pods-and-how-why-are-they-special x label return 0 It is guaranteed that there will be no padding in the beginning of a POD object. In other words if a POD class..
Flags to enable thorough and verbose g++ warnings http://stackoverflow.com/questions/5088460/flags-to-enable-thorough-and-verbose-g-warnings on because not all classes have enough elements to remove padding at the end. In theory I could get some extra variables for 'free'..
http://stackoverflow.com/questions/869883/why-is-strncpy-insecure the slash off. Only copy len 1 characters to avoid zero padding. buf len 0 This program contains a buffer overflow but the overflowing..
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