cpp / expert
Snippet
Compile-Time Branching with SFINAE and enable_if
Utilizes Substitution Failure Is Not An Error (SFINAE) and std::enable_if to select function overloads at compile-time based on type properties. This allows for highly optimized, type-specific logic without runtime overhead.
snippet.cpp
cpp
1
2
3
4
5
6
7
8
9
10
11
12
13
template <typename T>typename std::enable_if<std::is_integral<T>::value, T>::typecompute(T val) {return val * 2; // Logic for integers}template <typename T>typename std::enable_if<std::is_floating_point<T>::value, T>::typecompute(T val) {return val / 2.0; // Logic for floats}// Usage: compute(10); compute(10.5);
Breakdown
1
std::enable_if<std::is_integral<T>::value, T>::type
Ensures this overload only exists if T is an integral type.
2
compute(T val)
The function signature is only valid if the enable_if condition is met.