Questions tagged [static-if]
12 questions
13
votes
4 answers
static if in plain c++?
Problem in short:
How could one implement static if functionality, proposed in c++11, in plain c++ ?
History and original problem:
Recently I came up with a problem like this. I need a class Sender with an interface like
class Sender
{
void…
Grigor Gevorgyan
- 6,753
- 4
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- 64
13
votes
3 answers
Are there other languages besides D with static if?
I think D's static if is an interesting language feature. That prompts my question: Are there are other examples of compiled languages in which the compiler has a strong notion of the code and there are languages facilities to access them?
For…
Grumdrig
- 16,588
- 14
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8
votes
3 answers
Faking Static If in C++
I am testing combinations of various optimizations and for these I need a static-if as described in http://channel9.msdn.com/Events/GoingNative/GoingNative-2012/Static-If-I-Had-a-Hammer to enable and disable specific optimizations. if(const-expr)…
B.S.
- 1,435
- 2
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- 18
5
votes
2 answers
Is D's "static if" declarative or procedural?
Consider the following code:
static if (!is(MyStruct))
{
struct MyStruct
{
}
}
static if (is(MyStruct))
{
static assert(0);
}
My original understanding has been that the order of declarations (in global scope) does not matter in…
user541686
- 205,094
- 128
- 528
- 886
5
votes
6 answers
Will static_if deprecate template specialization?
Some usual template specialization like this:
template
class C
{
void common() { ... }
void f2 = delete;
};
template<>
class C
{
void common() { ... }
void f1() { ... }
};
Could be represented with static_if…
David
- 27,652
- 18
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4
votes
4 answers
static_if in C99's preprocessor
Is it possible to implement static_if in C99?
#define STATIC_IF(COND, ...) \
if (COND) MACRO1(__VA_ARGS__); \
else MACRO2(__VA_ARGS__);
How can I properly implement STATIC_IF(…) in here? Depending on COND the arguments either should be…
Kijewski
- 25,517
- 12
- 101
- 143
3
votes
1 answer
Avoid function call on compile time false condition
I want to be able avoid calling a function when a condition is false when this is known at compile time. Now I use something like this:
template
void fun(params)
{
//do nothing
}
template<>
void fun(params)
{
//do…
Mircea Ispas
- 20,260
- 32
- 123
- 211
2
votes
1 answer
"static-if" better with classes or function templates?
I want to define interface for serializing variables, where depending on a template argument, serialization code (true) or nothing (false) is performed. The serialization function is itself templated on archive and variable types.
Is it better to…
eudoxos
- 18,545
- 10
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1
vote
4 answers
Is there a C++ programming technique which is an approximate equivalent of a runtime #ifdef?
For example I have a function call in some code I want to be able to enable/disable as I like.
Normally I could just use an if, but then it would check each time if the function can be ran, which I don't want. I simply want the code to never do that…
jokoon
- 6,207
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0
votes
1 answer
If statements on compile-time const value
I want to have code included in a function based on a compile time constant value, but static_if is not a construct in C++.
So I can write functions like this
class TA {
public:
template
void func() {
if(flag)
…
Generic Name
- 1,083
- 1
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- 19
0
votes
0 answers
Ensure whether specific code is emitted or not
How can I ensure whether some specific code is not emitted?
Say, I tried to write something like a static switch (or static if) and I wish to detect whether second lambda operator ()'s body is emitted:
#include
namespace…
Tomilov Anatoliy
- 15,657
- 10
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- 169
-1
votes
1 answer
C++11 Class template method specialization and variadic templates
I am trying to construct the following kind of templated method using GCC and C++11:
class Foo
{
private:
//Device handle
cudnnHandle_t handle_;
//Batch sizes
std::vector batch_;
public:
Foo(cudnnHandle_t handle,…
Fiorentino
- 101
- 6