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Make parse_format_string constexpr

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This commit is contained in:
Victor Zverovich
2017-10-29 07:32:14 -07:00
parent e926ae78ac
commit db9ffa1405
2 changed files with 43 additions and 7 deletions
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32
test/format-test.cc
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@@ -1780,3 +1780,35 @@ TEST(FormatTest, ConstexprSpecsChecker) {
static_assert(check_specs("d").type == 'd', "");
static_assert(check_specs("{<").res == handler::ERROR, "");
}
struct test_format_string_handler {
constexpr void on_text(const char *, const char *) {}
constexpr void on_arg_id() {}
template <typename T>
constexpr void on_arg_id(T) {}
constexpr void on_replacement_field(const char *) {}
constexpr const char *on_format_specs(const char *s) { return s; }
constexpr void on_error(const char *) { error = true; }
bool error = false;
};
constexpr bool parse_string(const char *s) {
test_format_string_handler h;
fmt::internal::parse_format_string(s, h);
return !h.error;
}
TEST(FormatTest, ConstexprParseFormatString) {
static_assert(parse_string("foo"), "");
static_assert(!parse_string("}"), "");
static_assert(parse_string("{}"), "");
static_assert(parse_string("{42}"), "");
static_assert(parse_string("{foo}"), "");
static_assert(parse_string("{:}"), "");
}