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How to identify platform/compiler from preprocessor macros?
I'm writing a cross-platform code, which should compile at linux, windows, Mac OS. On windows, I must support visual studio and mingw.
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Compiling problems: cannot find crt1.o
...is you likely only have the gcc for your current architecture and that's 64bit. You need the 32bit support files. For that, you need to install them
sudo apt install gcc-multilib
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No ConcurrentList in .Net 4.0?
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The biggest scenario where a ConcurrentList would be a win would be when there isn't a whole lot of activity adding to the list, but there are many concurrent readers. One could reduce the readers' overhead to a single memory-barrier (and eliminate even that if readers weren't c...
64 bit OS下int占几个字节？ - C/C++ - 清泛网 - 专注C/C++及内核技术
64 bit OS下int占几个字节？int固定4字节，不要受64 bit的混淆。int是由编程语言设计决定的，不受编译器的影响。__int64才是8位的。另外，指针是受编译器 OS影响的，3...int固定4字节，不要受64 bit的混淆。int是由编程语言设计决定的...
How to export and import environment variables in windows?
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You can use RegEdit to export the following two keys:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Environment
HKEY_CURRENT_USER\Environment
The first set are system/global environment variables; the second set are user-level variables. ...
Is there a W3C valid way to disable autocomplete in a HTML form?
...1-transitional.dtd doctype, collecting a credit card number with the following HTML
17 Answers
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Undefined symbols for architecture arm64
... armv7s.
Note though, this means you won't get the full power of the 64 bit processor. You said you are building for the 5s, so there may be some reason you need this. If you for some reason absolutely need that power (perhaps you are building a game), and desperately need those files, you coul...
Best practices for circular shift (rotate) operations in C++
...<stdint.h> // for uint32_t
#include <limits.h> // for CHAR_BIT
// #define NDEBUG
#include <assert.h>
static inline uint32_t rotl32 (uint32_t n, unsigned int c)
{
const unsigned int mask = (CHAR_BIT*sizeof(n) - 1); // assumes width is a power of 2.
// assert ( (c<=mask...
Why do stacks typically grow downwards?
...ection strategy story. Makes some sense that text segments are laid out growing upwards-- programmers of yore had somewhat more direct contact with dealing with the implications of that than the stack.Thanks paxdiablo. The pointer to the set of alternative forms of stack implementations is also supe...
Virtual Memory Usage from Java under Linux, too much memory used
...es! Why does it need that?" Well, here's a way to make Hello World on a 64-bit JVM claim to take over 4 gigabytes ... at least by one form of measurement.
java -Xms1024m -Xmx4096m com.example.Hello
Different Ways to Measure Memory
On Linux, the top command gives you several different numbers fo...