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How can I get a file's size in C? [duplicate]
...ring, which I allocate using malloc() . Just writing malloc(10000*sizeof(char)); is IMHO a bad idea.
8 Answers
...
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...
Windows下 C++网络延时检测 - C/C++ - 清泛网 - 专注C/C++及内核技术
...
#define PING_TIMES 2 //ping 4 次
typedef struct _IPINFO
{
unsigned char Ttl; // Time To Live
unsigned char Tos; // Type Of Service
unsigned char IPFlags; // IP flags
unsigned char OptSize; // Size of options data
unsigned char FAR *Options; // Options data buffer
}IPINFO;...
Delete element in a slice
...d a slice while it is in range, it will induce some problem.
Old Answer:
chars := []string{"a", "a", "b"}
for i, v := range chars {
fmt.Printf("%+v, %d, %s\n", chars, i, v)
if v == "a" {
chars = append(chars[:i], chars[i+1:]...)
}
}
fmt.Printf("%+v", chars)
Expected :
[a a ...
std::string formatting like sprintf
...'ll have to do it first in a c-string, then copy it into a std::string:
char buff[100];
snprintf(buff, sizeof(buff), "%s", "Hello");
std::string buffAsStdStr = buff;
But I'm not sure why you wouldn't just use a string stream? I'm assuming you have specific reasons to not just do this:
st...
Variable number of arguments in C++?
...example (see it live):
void func(T, Args...) [T = int, Args = <double, char, std::basic_string<char>>]: 1
void func(T, Args...) [T = double, Args = <char, std::basic_string<char>>]: 2.5
void func(T, Args...) [T = char, Args = <std::basic_string<char>>]: a
void fu...
How can I check if a single character appears in a string?
...
You can use string.indexOf('a').
If the char a is present in string :
it returns the the index of the first occurrence of the character in
the character sequence represented by this object, or -1 if the
character does not occur.
...
Given an emacs command name, how would you find key-bindings ? (and vice versa)
...d bound to a keyboard shortcut (or a key sequence in Emacs terms), see the selected answer.
For programmatically getting the command bound to a given key sequence, use the function key-binding or lookup-key that takes a key sequence and returns its bound command. The function key-binding is what C-...
Lazy Method for Reading Big File in Python?
... assert len(list(rows(f, chunksize=chunksize))) == 1
@cleanup
def test_1_char_2_rows(chunksize=1024):
with open(test_file, 'w') as f:
f.write('|')
with open(test_file) as f:
assert len(list(rows(f, chunksize=chunksize))) == 2
@cleanup
def test_1_char(chunksize=1024):
w...
Throw an error in a MySQL trigger
... trigger_test values (1), (-1), (2); -- everything fails as one row is bad
select * from trigger_test;
insert into trigger_test values (1); -- succeeds as expected
insert into trigger_test values (-1); -- fails as expected
select * from trigger_test;
...