refactor: modernize ext::optional shim to std::optional (C++17), remove QL_USE_STD_OPTIONAL#5

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tobydrinkall wants to merge 9 commits into

devin/1780665255-migrate-std-optional

Commits on Jun 5, 2026

refactor(core): migrate ext::optional -> std::optional in settings/event/cashflow

devin-ai-integration[bot]
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tobydrinkall
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refactor(cashflows): migrate ext::optional -> std::optional

devin-ai-integration[bot]
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tobydrinkall
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refactor(instruments): migrate ext::optional -> std::optional

devin-ai-integration[bot]
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tobydrinkall
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refactor(pricingengines): migrate ext::optional -> std::optional

devin-ai-integration[bot]
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tobydrinkall
committed
refactor(termstructures): migrate ext::optional -> std::optional

devin-ai-integration[bot]
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tobydrinkall
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refactor(experimental+time): migrate ext::optional -> std::optional

devin-ai-integration[bot]
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tobydrinkall
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refactor(test-suite): migrate ext::optional -> std::optional

devin-ai-integration[bot]
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tobydrinkall
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refactor: swap #include <ql/optional.hpp> -> #include <optional> across all files

devin-ai-integration[bot]
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tobydrinkall
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build: remove dead QL_USE_STD_OPTIONAL flag; reduce ql/optional.hpp to deprecated forwarding header

devin-ai-integration[bot]
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tobydrinkall
committed