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Fix set_value template deduction for smart string types #633

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Fix set_value template deduction for smart string types #633

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2391e6f
Fix set_value template deduction for smart string types
Apr 21, 2026
d783f27
Refactor set_value_type to use struct template with remove_cv_t
Apr 22, 2026
851030a
Merge branch 'master' into fix-set-value-type-const-deduction
dunhor May 1, 2026
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12 changes: 6 additions & 6 deletions include/wil/registry_helpers.h
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Original file line number Diff line number Diff line change
Expand Up @@ -1006,7 +1006,7 @@ namespace reg
}

template <>
constexpr DWORD set_value_type<const ::std::wstring>() WI_NOEXCEPT
constexpr DWORD set_value_type<::std::wstring>() WI_NOEXCEPT
{
return REG_SZ;
}
Expand All @@ -1025,13 +1025,13 @@ namespace reg
}

template <>
constexpr DWORD set_value_type<const BSTR>() WI_NOEXCEPT
constexpr DWORD set_value_type<BSTR>() WI_NOEXCEPT
{
return REG_SZ;
}

template <>
constexpr DWORD set_value_type<const ::wil::unique_bstr>() WI_NOEXCEPT
constexpr DWORD set_value_type<::wil::unique_bstr>() WI_NOEXCEPT
{
return REG_SZ;
}
Expand All @@ -1046,7 +1046,7 @@ namespace reg
}

template <>
constexpr DWORD set_value_type<const ::wil::shared_bstr>() WI_NOEXCEPT
constexpr DWORD set_value_type<::wil::shared_bstr>() WI_NOEXCEPT
{
return REG_SZ;
}
Expand All @@ -1060,7 +1060,7 @@ namespace reg
}

template <>
constexpr DWORD set_value_type<const ::wil::unique_cotaskmem_string>() WI_NOEXCEPT
constexpr DWORD set_value_type<::wil::unique_cotaskmem_string>() WI_NOEXCEPT
{
return REG_SZ;
}
Expand All @@ -1074,7 +1074,7 @@ namespace reg
}

template <>
constexpr DWORD set_value_type<const ::wil::shared_cotaskmem_string>() WI_NOEXCEPT
constexpr DWORD set_value_type<::wil::shared_cotaskmem_string>() WI_NOEXCEPT
{
return REG_SZ;
}
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37 changes: 37 additions & 0 deletions tests/RegistryTests.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -2196,6 +2196,43 @@ TEST_CASE("BasicRegistryTests::string types", "[registry]")
#endif
}

SECTION("strings set_value with std::wstring lvalue: with opened key")
{
wil::unique_hkey hkey;
REQUIRE_SUCCEEDED(wil::reg::create_unique_key_nothrow(HKEY_CURRENT_USER, testSubkey, hkey, wil::reg::key_access::readwrite));

// verify non-const std::wstring lvalue works with set_value (issue #624)
std::wstring stringValue{L"wstring lvalue test"};
wil::reg::set_value(hkey.get(), stringValueName, stringValue);
auto result = wil::reg::get_value<std::wstring>(hkey.get(), stringValueName);
REQUIRE(result == stringValue);

// verify const std::wstring lvalue also works
const std::wstring constStringValue{L"const wstring test"};
wil::reg::set_value(hkey.get(), stringValueName, constStringValue);
result = wil::reg::get_value<std::wstring>(hkey.get(), stringValueName);
REQUIRE(result == constStringValue);

// verify empty std::wstring
std::wstring emptyValue;
wil::reg::set_value(hkey.get(), stringValueName, emptyValue);
result = wil::reg::get_value<std::wstring>(hkey.get(), stringValueName);
REQUIRE(result.empty());
}

SECTION("strings set_value with std::wstring lvalue: with string key")
{
std::wstring stringValue{L"wstring lvalue subkey test"};
wil::reg::set_value(HKEY_CURRENT_USER, testSubkey, stringValueName, stringValue);
auto result = wil::reg::get_value<std::wstring>(HKEY_CURRENT_USER, testSubkey, stringValueName);
REQUIRE(result == stringValue);

const std::wstring constStringValue{L"const wstring subkey test"};
wil::reg::set_value(HKEY_CURRENT_USER, testSubkey, stringValueName, constStringValue);
result = wil::reg::get_value<std::wstring>(HKEY_CURRENT_USER, testSubkey, stringValueName);
REQUIRE(result == constStringValue);
}

#if defined(__cpp_lib_optional)
SECTION("strings set_value_string/try_get_value_string: with open key")
{
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