Static Loops

poet::static_for expands an integer range at compile time.

Basic form

poet::static_for<0, 4>([](auto I) {
    use(I);
});

The callable may also be a template call operator:

poet::static_for<4>([]<auto I>() {
    use_compile_time_index<I>();
});

Step and direction

poet::static_for<0, 10, 2>([](auto I) {
    // 0, 2, 4, 6, 8
});

poet::static_for<9, 4, -1>([](auto I) {
    // 9, 8, 7, 6, 5
});

Block size

The default block size covers the full range. Pass the fourth template parameter when a large body benefits from smaller outlined blocks:

poet::static_for<0, 64, 1, 8>([](auto I) {
    heavy_work(I);
});

Use this only when profiling shows register-pressure or compile-time issues.

Runnable example

• Full source: examples/static_for.cpp

• Try on Compiler Explorer

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