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C语言结构体里的成员数组和指针 - C/C++ - 清泛网 - 专注C/C++及内核技术
...->p的偏移之所以是0x8而不是0x6，是因为内存对齐了（我在64位系统上）。关于内存对齐，可参看《深入理解C语言》一文。
好了，现在你知道为什么原题中会访问到了0x4的地址了吧，因为是相对地址。
相对地址有很好多处，其...
How to know what the 'errno' means?
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For reference, here is a list from Ubuntu 14.04 amd64 pastebin.com/407gDBPq
– kevinf
Aug 8 '14 at 18:31
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An efficient way to transpose a file in Bash
...s slightly faster than awk - 350.103s vs. 369.410s I was using perl 5.8.8 64bit
– Federico Giorgi
Nov 16 '09 at 10:18
1
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How to sum up elements of a C++ vector?
...rder: #include <numeric> and std::accumulate(v.begin(), v.end(), (int64_t)0);. Notice that the type of the initial accumulator value is used as the accumulator type, so if you want to sum 8-bit elements into a 64-bit result, that's how you do it.
– Peter Cordes
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How do I change the color of radio buttons?
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Updating from @markreyes: Works in Chrome (64-bit 73.0.3683.75), works somewhat in Safari (12.0.3), and doesn't work in Firefox (64-bit 65.0.1) on March 15 2019.
– jarhill0
Mar 16 '19 at 2:12
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When to use enumerateObjectsUsingBlock vs. for
...ormat:@"%d", i];
}
int i;
__block NSUInteger length;
i = 1000 * 1000;
uint64_t a1 = mach_absolute_time();
while (--i > 0) {
for (NSString *s in arr) {
length = s.length;
}
}
NSLog(@"For-in %llu", mach_absolute_time()-a1);
i = 1000 * 1000;
uint64_t b1 = mach_absolute_time();
whil...
gdb: how to print the current line or find the current line number?
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kumar_m_kirankumar_m_kiran
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How can you check which options vim was compiled with?
...cc -c -I. -D_FORTIFY_SOURCE=0 -Iproto -DHAVE_CONFIG_H -arch i386 -arch x86_64 -g -Os -pipe
Linking: gcc -arch i386 -arch x86_64 -o vim -lncurses
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Why is there huge performance hit in 2048x2048 versus 2047x2047 array multiplication?
...n your cache. L is always power of 2.
The six comes from fact that 2^6 == 64 bytes is standard size of cache line.
Now what does this mean? Well it means that if I have address X and address Y and
(X >> 6) - (Y >> 6) is divisible by L (i.e. some large power of 2), they will be stored ...
AngularJS changes URLs to “unsafe:” in extension page
... Bob Fanger
23.7k77 gold badges5252 silver badges6464 bronze badges
answered Apr 2 '13 at 16:51
Philip BulleyPhilip Bulley
7,86...