Hi all,
I found a way to make CT strings in C++14, with the help of generic lambda.
FYI, Ábel Sinkovics has presented a c++11 CT string in his
mpllibs::metaparse[1] lib before, but it requires some PP trick which has a
predefined limit MPLLIBS_LIMIT_STRING_SIZE.
The new trick doesn't suffer from the limitation, but it assumes a
null-terminated string.
It's fairly simple, see below:
```c++
template
struct str {};
template<char c>
struct ch {};
template<int n>
using idx = std::integral_constant;
template
auto accum(S s, ch<c>, str)
{
return accum(s, s(idx()), str());
}
template
auto accum(S, ch<0>, str ret)
{
return ret;
}
template<class S>
auto make_str(S s)
{
return accum(s, s(idx<0>()), str<>());
}
#define LIT(s) make_str([](auto idx) { return ch(); })
```
Then you can use `doSomething(LIT("abc"))` in your code.
What do you think?
[1] http://abel.web.elte.hu/mpllibs/metaparse/
