How to solve the problem that C++ compiler does not support concepts?
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T.48: if your compiler does not support concepts, use enable_if to emulate it
Reason (reason)
Because that's the best we can do without direct concept support. Enable_if can be used to conditionally define functions and to select among a set of functions.
Because this is the best practice that can be taken when direct support for concept cannot be active. Enable_if can be used to conditionally define functions and choose from a set of functions.
Example (sample)
Template
Enable_if_t
F (T v)
{
/ /...
}
/ / Equivalent to:
Template
Void f (T v)
{
/ /...
} Note (note)
Beware of complementary constraints. Faking concept overloading using enable_if sometimes forces us to use that error-prone design technique.
Avoid complementary constraints. Using enable_if to simulate conceptual overloading sometimes requires us to use error-prone design techniques.
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