29 lines
1.4 KiB
Markdown
29 lines
1.4 KiB
Markdown
# Programmability {#programmability}
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Fill in a secret index or payload after the key exists, rewrite an
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updatable leaf, or commit to a vector before choosing which coordinate
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to open.
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| Mechanism | What it does |
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| --- | --- |
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| [dpf::wildcard_value](@ref dpf/wildcard.hpp) | Placeholder input or leaf. Eval throws until you assign. |
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| Leaf assign | `compute_and_get_blinded_output_share`, `reconstruct_correction_word`, `async_assign_leaf`, `assign_cmp` — see [wildcard assign](@ref wildcard_assign). |
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| [dpf::updatable](@ref dpf/placement.hpp) | Beaver leaf so a later rewrite replaces the payload without regenerating the spine. |
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| [dpf::ppvc](@ref ppvc_manual) | Point-programmable vector commitment: bind `(Z/2^s Z)^n`, then open one hidden coordinate (or the sum). |
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| [dpf::at](@ref dpf/placement.hpp) / `idpf` | Plant values on public prefixes as well as the leaf. |
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```cpp
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auto [k0, k1] = dpf::make_dpf(
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std::uint8_t{12},
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dpf::wildcard_value<std::uint32_t>{});
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// assign the payload later; eval before assign throws
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using scheme = dpf::ppvc<std::uint8_t, 8>;
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const auto pp = scheme::setup();
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const auto [com, st] = scheme::commit(pp);
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const auto op = scheme::open(st, 0, 0x5a, std::uint8_t{40});
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```
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**Go deeper:** [guided tour — wildcards](@ref tour_outputs),
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[PPVC](@ref tour_ppvc), [PPVC manual](@ref ppvc_manual),
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[input types](@ref input_types), [output types](@ref output_types).
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