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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
... <stdio.h>
struct str{
int len;
char s[0];
};
struct foo {
struct str *a;
};
int main(int argc, char** argv) {
struct foo f={0};
if (f.a->s) {
printf( f.a->s);
}
return 0;
}
你编译一下上面的代码，在...
Xcode - How to fix 'NSUnknownKeyException', reason: … this class is not key value coding-compliant f
...but the following <userDefinedRuntimeAttributes> remained in xml (of foo.storyboard):
<userDefinedRuntimeAttributes>
<userDefinedRuntimeAttribute type="color" keyPath="shadowColor">
<color key="value" white="0.0" alpha="1" colorSpace="custom" customColorSpace="genericGa...
Swift - How to convert String to Double
...se it returns 0 for non number values. This means that the doubleValue of "foo" and "0" are the same.)
let myDouble = Double(myString)
This returns an optional, so in cases like passing in "foo" where doubleValue would have returned 0, the failable intializer will return nil. You can use a guard,...
Simulate first call fails, second call succeeds
...meMethod("some arg"))
.thenThrow(new RuntimeException())
.thenReturn("foo");
//First call: throws runtime exception:
mock.someMethod("some arg");
//Second call: prints "foo"
System.out.println(mock.someMethod("some arg"));
So in your case, you'd want:
when(myMock.doTheCall())
.thenRetu...
Iterate through the fields of a struct in Go
...(play):
import (
"fmt"
"reflect"
)
func main() {
x := struct{Foo string; Bar int }{"foo", 2}
v := reflect.ValueOf(x)
values := make([]interface{}, v.NumField())
for i := 0; i < v.NumField(); i++ {
values[i] = v.Field(i).Interface()
}
fmt.Println(value...
Alternate FizzBuzz Questions [closed]
...nswered Sep 22 '08 at 22:12
shelfooshelfoo
1,7281212 silver badges1515 bronze badges
...
In a Bash script, how can I exit the entire script if a certain condition occurs?
...ipt if a pipeline or command structure returns non-zero value. For example foo || bar will fail only if both foo and bar return non-zero value. Usually a well written bash script will work if you add set -e at the start and the addition works as an automated sanity check: abort the script if anythin...
Implementing two interfaces in a class with same method. Which interface method is overridden?
...ith the situation where you need to implement two Colliding Interface, say Foo and Bar. Basically you have your class implement one of the interfaces, say Foo, and provide a Bar asBar() method to return an inner class that implements the second Bar interface. Not perfect since your class is ultimate...
How to use permission_required decorators on django class-based views
...ll work when used the way it was originally intended:
@login_required
def foo(request):
return HttpResponse('bar')
but will also work properly when used like so:
@login_required
class FooView(DetailView):
model = Foo
This seems to work fine in several cases i've recently come across, i...
Looking for files NOT owned by someone
... with a backslash as it is a shell metacharacter. Result:
find . \! -user foo -print
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