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Allow getting size of dynamic format arg store #4270

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merged 1 commit into from
Dec 19, 2024
Merged

Allow getting size of dynamic format arg store #4270

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3 changes: 3 additions & 0 deletions include/fmt/args.h
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Original file line number Diff line number Diff line change
Expand Up @@ -210,6 +210,9 @@ template <typename Context> class dynamic_format_arg_store {
data_.reserve(new_cap);
named_info_.reserve(new_cap_named);
}

/// Returns the number of elements in the store.
size_t size() const noexcept { return data_.size(); }
};

FMT_END_NAMESPACE
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14 changes: 14 additions & 0 deletions test/args-test.cc
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Expand Up @@ -186,3 +186,17 @@ TEST(args_test, move_constructor) {
store.reset();
EXPECT_EQ(fmt::vformat("{} {} {a1}", moved_store), "42 foo foo");
}

TEST(args_test, size) {
fmt::dynamic_format_arg_store<fmt::format_context> store;
EXPECT_EQ(store.size(), 0);

store.push_back(42);
EXPECT_EQ(store.size(), 1);

store.push_back("Molybdenum");
EXPECT_EQ(store.size(), 2);

store.clear();
EXPECT_EQ(store.size(), 0);
}
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