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Optional Parameters with C++ Macros
... You could get a clear compilation error if you converted the selected argument which is supposed to be a MACRO name to string using # (the pound sign) and compared it's first n characters with the expected prefix and if there is no match, printed an informative error.
...
C＋＋模板的特化 - C/C++ - 清泛网 - 专注C/C++及内核技术
... t1, const T t2)
{
return t1 < t2 ? t2 : t1;
}
template <>
const char* mymax(const char* t1,const char* t2)
{
return (strcmp(t1,t2) < 0) ? t2 : t1;
}
但是你不能这么搞：
template <>
bool mymax(const char* t1,const char* t2)
{
return (strcmp(t1,t2) < 0);
}
其实...
Oracle PL/SQL - How to create a simple array variable?
... INDEX BY PLS_INTEGER;
employee_array employee_arraytype;
BEGIN
SELECT *
BULK COLLECT INTO employee_array
FROM employee
WHERE department = 10;
--
FOR i IN employee_array.FIRST .. employee_array.LAST
LOOP
-- Do something
END LOOP;
END;
The associative arra...
Why declare a struct that only contains an array in C?
...ever you declare such an object. This could also be achieved with
typedef char ABC[MAX];
but then you have a much bigger problem: you have to be aware that ABC is an array type (even though you can't see this when you declare variables of type ABC) or else you'll get stung by the fact that ABC wi...
Will strlen be calculated multiple times if used in a loop condition?
...g the string, a for loop is probably not the best way to iterate over each character. I'd think a while loop is more direct and easier to manage the index counter.
– mlibby
Jul 6 '12 at 15:40
...
Printing all global variables/local variables?
...
In case you want to see the local variables of a calling function use select-frame before info locals
E.g.:
(gdb) bt
#0 0xfec3c0b5 in _lwp_kill () from /lib/libc.so.1
#1 0xfec36f39 in thr_kill () from /lib/libc.so.1
#2 0xfebe3603 in raise () from /lib/libc.so.1
#3 0xfebc2961 in abort () f...
C++ templates Turing-complete?
...;
template<int n>
struct State {
enum { value = n };
static char const * name;
};
template<int n>
char const* State<n>::name = "unnamed";
struct QAccept {
enum { value = -1 };
static char const* name;
};
struct QReject {
enum { value = -2 };
static char ...
How to construct a std::string from a std::vector?
...a quicker/alternative/"better" way to initialize a string from a vector of chars?
7 Answers
...
Clearing a string buffer/builder after loop
...t of creating the SB outside is not losing the internal (potentially long) char[] of it. If in the first iterator it grew up enough, the second loop will not need to resize any char[]. But for getting the advantage the "clear method" will have to preserve the size of the internal array. setLength do...
Remove not alphanumeric characters from string
...
Removing non-alphanumeric chars
The following is the/a correct regex to strip non-alphanumeric chars from an input string:
input.replace(/\W/g, '')
Note that \W is the equivalent of [^0-9a-zA-Z_] - it includes the underscore character. To also rem...