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Clarify that compile-time checks don't support named arguments

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This commit is contained in:
Victor Zverovich 2019-01-27 09:05:50 -08:00
parent 4f6fda558c
commit 06c005b7b0
3 changed files with 18 additions and 2 deletions
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3
doc/api.rst
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@ -56,6 +56,8 @@ Named arguments
.. doxygenfunction:: fmt::arg(string_view, const T&)
Named arguments are not supported in compile-time checks at the moment.
Argument lists
--------------
@ -92,6 +94,7 @@ string checks, output iterator and user-defined type support.
Compile-time format string checks
---------------------------------
.. doxygendefine:: FMT_STRING
.. doxygendefine:: fmt
Formatting user-defined types

14
include/fmt/format.h
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@ -2117,7 +2117,9 @@ class format_string_checker {
context_.check_arg_id(id);
check_arg_id();
}
FMT_CONSTEXPR void on_arg_id(basic_string_view<Char>) {}
FMT_CONSTEXPR void on_arg_id(basic_string_view<Char>) {
on_error("compile-time checks don't support named arguments");
}
FMT_CONSTEXPR void on_replacement_field(const Char*) {}
@ -3495,6 +3497,16 @@ inline internal::udl_arg<wchar_t> operator"" _a(const wchar_t* s, std::size_t) {
#endif // FMT_USE_USER_DEFINED_LITERALS
FMT_END_NAMESPACE
/**
\rst
Constructs a compile-time format string.
**Example**::
// A compile-time error because 'd' is an invalid specifier for strings.
std::string s = format(FMT_STRING("{:d}"), "foo");
\endrst
*/
#define FMT_STRING(s) \
[] { \
struct str : fmt::compile_string { \

3
test/format-test.cc
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@ -2357,7 +2357,8 @@ TEST(FormatTest, FormatStringErrors) {
EXPECT_ERROR("{:d}", "invalid type specifier", std::string);
EXPECT_ERROR("{:s}", "invalid type specifier", void*);
# endif
EXPECT_ERROR("{foo", "missing '}' in format string", int);
EXPECT_ERROR("{foo",
"compile-time checks don't support named arguments", int);
EXPECT_ERROR_NOARGS("{10000000000}", "number is too big");
EXPECT_ERROR_NOARGS("{0x}", "invalid format string");
EXPECT_ERROR_NOARGS("{-}", "invalid format string");