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Compile time string hashing
...7b82d07L,
...
};
template<size_t idx>
constexpr uint32_t crc32(const char * str)
{
return (crc32<idx-1>(str) >> 8) ^ crc_table[(crc32<idx-1>(str) ^ str[idx]) & 0x000000FF];
}
// This is the stop-recursion function
template<>
constexpr uint32_t crc32<size_t(-...
What is the strict aliasing rule?
...ict aliasing in your compiler (f[no-]strict-aliasing in gcc))
You can use char* for aliasing instead of your system's word. The rules allow an exception for char* (including signed char and unsigned char). It's always assumed that char* aliases other types. However this won't work the other way: th...
error C2440: \'initializing\' : cannot convert from \'char *\' to \'co...
error C2440: 'initializing' : cannot convert from 'char *' to 'const class std::basic_string *'error C2440: 'initializing' : cannot convert from 'char *' to 'const class std::basic_string<char,...error C2440: 'initializing' : cannot convert from 'char *' to 'const class std::basic_string<char,struct...
Convert array of integers to comma-separated string
...= new int[5] {1,2,3,4,5};
You can use Linq for it
String arrTostr = arr.Select(a => a.ToString()).Aggregate((i, j) => i + "," + j);
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fo...
OS detecting makefile
...detected_OS := $(patsubst MINGW%,MSYS,$(detected_OS))
endif
Then you can select the relevant stuff depending on detected_OS:
ifeq ($(detected_OS),Windows)
CFLAGS += -D WIN32
endif
ifeq ($(detected_OS),Darwin) # Mac OS X
CFLAGS += -D OSX
endif
ifeq ($(detected_OS),Linux)
CFLAGS ...
In Python, how do I create a string of n characters in one line of code?
I need to generate a string with n characters in Python. Is there a one line answer to achieve this with the existing Python library? For instance, I need a string of 10 letters:
...
Remove all occurrences of char from string
...
Try using the overload that takes CharSequence arguments (eg, String) rather than char:
str = str.replace("X", "");
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Error “initializer element is not constant” when trying to initialize variable with const
...s_pFooInit = (&(const foo_t){ .a=2, .b=4, .c=6 });
int main (int argc, char **argv) {
const foo_t *const f1 = &s_FooInit;
const foo_t *const f2 = s_pFooInit;
printf("Foo1 = %d, %d, %d\n", f1->a, f1->b, f1->c);
printf("Foo2 = %d, %d, %d\n", f2->a, f2->b, f2->...
Can I call a constructor from another constructor (do constructor chaining) in C++?
...).
The syntax is slightly different from C#:
class Foo {
public:
Foo(char x, int y) {}
Foo(int y) : Foo('a', y) {}
};
C++03: No
Unfortunately, there's no way to do this in C++03, but there are two ways of simulating this:
You can combine two (or more) constructors via default parameters...
Get Android Device Name [duplicate]
... s) {
if (s == null || s.length() == 0) {
return "";
}
char first = s.charAt(0);
if (Character.isUpperCase(first)) {
return s;
} else {
return Character.toUpperCase(first) + s.substring(1);
}
}
...