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Where is C not a subset of C++? [closed]
...zeof('a') is equal to sizeof(int).
In C++, sizeof('a') is equal to sizeof(char).
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What is the MySQL VARCHAR max size?
I would like to know what the max size is for a MySQL VARCHAR type.
7 Answers
7
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What uses are there for “placement new”?
...d, and
constructing an object on a
pre-allocated buffer takes less time):
char *buf = new char[sizeof(string)]; // pre-allocated buffer
string *p = new (buf) string("hi"); // placement new
string *q = new string("hi"); // ordinary heap allocation
You may also want to be sure there can...
Append a Lists Contents to another List C#
...
Perhaps you meant Concat ... though that would mean a lot of copying, and is a good illustration of how not to use LINQ.
– Jim Balter
Nov 10 '18 at 20:07
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How to print a int64_t type in C
...t:
#include <stdio.h>
#include <stdint.h>
int main(int argc, char *argv[])
{
int64_t a = 1LL << 63;
uint64_t b = 1ULL << 63;
printf("a=%jd (0x%jx)\n", a, a);
printf("b=%ju (0x%jx)\n", b, b);
return 0;
}
Compiling this code with gcc -Wall -pedantic -...
using extern template (C++11)
....cpp
template<typename T>
void f(){}
// Explicit instantiation for char.
template void f<char>();
Main.cpp
#include "TemplHeader.h"
// Commented out from OP code, has no effect.
// extern template void f<T>(); //is this correct?
int main() {
f<char>();
return 0...
What breaking changes are introduced in C++11?
...hose for others to elaborate on.
Core language
#define u8 "abc"
const char *s = u8"def"; // Previously "abcdef", now "def"
#define _x "there"
"hello"_x // now a user-defined-string-literal. Previously, expanded _x .
New keywords: alignas, alignof, char16_t, char32_t, constexpr, declt...
Running Python code in Vim
...n to run your script (it could be replaced with
ruby for example)
% concats the current filename, passing it as a parameter to the
python command
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How can I wait for set of asynchronous callback functions?
...sn't work inside .then functions for me. But you can use a .forEach and [].concat() or something similar)
Promise.all([
fetch('/user/4'),
fetch('/user/5'),
fetch('/user/6'),
fetch('/user/7'),
fetch('/user/8')
]).then(responses => {
return responses.map(response => {response.json()...
How do I turn off Oracle password expiration?
...Show the status of the account before reset.
SELECT
ACCOUNT_STATUS,
TO_CHAR(LOCK_DATE, 'YYYY-MM-DD HH24:MI:SS') AS LOCK_DATE,
TO_CHAR(EXPIRY_DATE, 'YYYY-MM-DD HH24:MI:SS') AS EXPIRY_DATE
FROM
DBA_USERS
WHERE
USERNAME = '&USER_NAME';
REM Create SQL*Plus variable to hold the existing va...