Map an unsigned integral constant to a distinct C++ type.
Declared in <bslmf_tag.h>
template<unsigned int t_N>
struct Tag;This template class is never intended to produce a run-time instance. The only useful attribute of a tag is its size (which is, of course, computable at compile time, even if an instance is never created). Note that in case of overflow on Linux 64-bit machines, we split the size into 2 data members.
| Name | Description |
|---|---|
d_lowerSizeArray | Lower 16 bits of the compile-time size encoded by this tag. |
d_upperSizeArray | Upper 16 bits of the compile-time size encoded by this tag. |
| Name | Description |
|---|---|
operator, | Detect non-void expressions via an overloaded comma operator. |
| Name | Description |
|---|---|
InvokeResult_VoidChecker | Empty type used to detect void expressions. The size of this type is the same as bslmf::Tag<1>. |