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String conversions (#421)

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* add a variant of the string conversions for the default string operations.  Discriminate between the is_convertible and is_constructible type traits for object.

* update the test to test the different situations with the funny string like type
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Philip Top 2020-01-31 04:49:40 -08:00 committed by GitHub
parent 6b7f6a7480
commit ee851c7e88
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2 changed files with 33 additions and 3 deletions
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15
include/CLI/TypeTools.hpp
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@ -219,15 +219,24 @@ template <typename S> class is_tuple_like {
};
/// Convert an object to a string (directly forward if this can become a string)
template <typename T, enable_if_t<std::is_constructible<std::string, T>::value, detail::enabler> = detail::dummy>
template <typename T, enable_if_t<std::is_convertible<T, std::string>::value, detail::enabler> = detail::dummy>
auto to_string(T &&value) -> decltype(std::forward<T>(value)) {
return std::forward<T>(value);
}
/// Construct a string from the object
template <typename T,
enable_if_t<std::is_constructible<std::string, T>::value && !std::is_convertible<T, std::string>::value,
detail::enabler> = detail::dummy>
std::string to_string(const T &value) {
return std::string(value);
}
/// Convert an object to a string (streaming must be supported for that type)
template <typename T,
enable_if_t<!std::is_constructible<std::string, T>::value && is_ostreamable<T>::value, detail::enabler> =
detail::dummy>
enable_if_t<!std::is_convertible<std::string, T>::value && !std::is_constructible<std::string, T>::value &&
is_ostreamable<T>::value,
detail::enabler> = detail::dummy>
std::string to_string(T &&value) {
std::stringstream stream;
stream << value;

21
tests/AppTest.cpp
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@ -1885,6 +1885,27 @@ TEST_F(TApp, VectorUnlimString) {
EXPECT_EQ(answer, strvec);
}
// From https://github.com/CLIUtils/CLI11/issues/420
TEST_F(TApp, stringLikeTests) {
struct nType {
explicit nType(const std::string &a_value) : m_value{a_value} {}
explicit operator std::string() const { return std::string{"op str"}; }
std::string m_value;
};
nType m_type{"abc"};
app.add_option("--type", m_type, "type")->capture_default_str();
run();
EXPECT_EQ(app["--type"]->as<std::string>(), "op str");
args = {"--type", "bca"};
run();
EXPECT_EQ(std::string(m_type), "op str");
EXPECT_EQ(m_type.m_value, "bca");
}
TEST_F(TApp, VectorExpectedRange) {
std::vector<std::string> strvec;