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[doc] descriptor: explain GetPubKey() usage with cached public key

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Plus a few typo fixes.
This commit is contained in:
Sjors Provoost
2018-12-12 10:08:08 +01:00
parent 2290269759
commit 2e68ffaf20
2 changed files with 8 additions and 4 deletions
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6
src/script/descriptor.cpp
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@@ -207,9 +207,11 @@ public:
/** Base class for all Descriptor implementations. */
class DescriptorImpl : public Descriptor
{
//! Public key arguments for this descriptor (size 1 for PK, PKH, WPKH; any size of Multisig).
//! Public key arguments for this descriptor (size 1 for PK, PKH, WPKH; any size for Multisig).
const std::vector<std::unique_ptr<PubkeyProvider>> m_pubkey_args;
//! The sub-descriptor argument (nullptr for everything but SH and WSH).
//! In doc/descriptors.m this is referred to as SCRIPT expressions sh(SCRIPT)
//! and wsh(SCRIPT), and distinct from KEY expressions and ADDR expressions.
const std::unique_ptr<DescriptorImpl> m_subdescriptor_arg;
//! The string name of the descriptor function.
const std::string m_name;
@@ -295,6 +297,8 @@ public:
// Construct temporary data in `entries` and `subscripts`, to avoid producing output in case of failure.
for (const auto& p : m_pubkey_args) {
entries.emplace_back();
// If we have a cache, we don't need GetPubKey to compute the public key.
// Pass in nullptr to signify only origin info is desired.
if (!p->GetPubKey(pos, arg, cache_read ? nullptr : &entries.back().first, entries.back().second)) return false;
if (cache_read) {
// Cached expanded public key exists, use it.