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What are some uses of template template parameters?
...ALUE> class interface {
void do_something(VALUE v) {
static_cast<DERIVED*>(this)->do_something(v);
}
};
template <typename VALUE> class derived : public interface<derived, VALUE> {
void do_something(VALUE v) { ... }
};
typedef interface<derived<int...
How can I add to List
...
You can't (without unsafe casts). You can only read from them.
The problem is that you don't know what exactly the list is a list of. It could be a list of any subclass of Number, so when you try to put an element into it, you don't know that the ele...
How do I safely pass objects, especially STL objects, to and from a DLL?
...iginal_type get() const
{
original_type result;
result = static_cast<original_type>(*data);
return result;
}
void set_from(const original_type& value)
{
data = reinterpret_cast<safe_type*>(pod_helpers::pod_malloc(sizeof(safe_type))); //note the pod_malloc c...
How do I modify fields inside the new PostgreSQL JSON datatype?
...nb manipulation functionality within PostgreSQL itself (but none for json; casts are required to manipulate json values).
Merging 2 (or more) JSON objects (or concatenating arrays):
SELECT jsonb '{"a":1}' || jsonb '{"b":2}', -- will yield jsonb '{"a":1,"b":2}'
jsonb '["a",1]' || jsonb '["b",2...
Why is it slower to iterate over a small string than a small list?
...IIObject *)(op))->state.kind) is (I think) an indirection and a C-level cast);
#define PyUnicode_DATA(op) \
(assert(PyUnicode_Check(op)), \
PyUnicode_IS_COMPACT(op) ? _PyUnicode_COMPACT_DATA(op) : \
_PyUnicode_NONCOMPACT_DATA(op))
(which is also boring for similar reasons, assu...
Exporting functions from a DLL with dllexport
... ::LoadLibrary(T"opengl_plugin.dll");
m_pfnGetEngineVersion = reinterpret_cast<fnGetEngineVersion *>(
::GetProcAddress(m_hDLL, "getEngineVersion")
);
m_pfnRegisterPlugin = reinterpret_cast<fnRegisterPlugin *>(
::GetProcAddress(m_hDLL, "registerPlugin")
);
...
Foreign Key to multiple tables
...
ID int primary key,
Name varchar(50) NOT NULL,
PartyTypeId as cast(2 as tinyint) persisted,
foreign key (ID, PartyTypeId) references Party(PartyId, PartyTypeID)
)
CREATE TABLE dbo.[User]
(
ID int primary key,
Name varchar(50) NOT NULL,
PartyTypeId as cast(1 as tinyint...
Why is String.chars() a stream of ints in Java 8?
... know that the IntStream contains char values represented as ints and that casting must be done at the proper place. This is doubly confusing because there are overloaded API calls like PrintStream.print(char) and PrintStream.print(int) that differ markedly in their behavior. An additional point of ...
What are the best PHP input sanitizing functions?
... expect a number, make sure the submitted data is a number. You can also cast user data into other types. Everything submitted is initially treated like a string, so forcing known-numeric data into being an integer or float makes sanitization fast and painless.
What about free-form text fields an...
Troubleshooting “Illegal mix of collations” error in mysql
... option is to use the BINARY operator:
BINARY str is the shorthand for CAST(str AS BINARY).
Your solution might look something like this:
SELECT * FROM table WHERE BINARY a = BINARY b;
or,
SELECT * FROM table ORDER BY BINARY a;
...