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Complete FMT_VARIADIC.

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This commit is contained in:
Victor Zverovich 2014-06-28 13:31:44 -07:00
parent 9c8db26457
commit 428d114766
1 changed files with 37 additions and 16 deletions
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49
format.h
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@ -855,6 +855,7 @@ inline StrFormatSpec<wchar_t> pad(
return StrFormatSpec<wchar_t>(str, width, fill);
}
// An argument list.
class ArgList {
private:
const internal::ArgInfo *args_;
@ -2170,6 +2171,8 @@ inline void FormatDec(char *&buffer, T value) {
#if FMT_GCC_VERSION
// Use the system_header pragma to suppress warnings about variadic macros
// because suppressing -Wvariadic-macros with the diagnostic pragma doesn't work.
// It is used at the end because we want to suppress as little warnings as
// possible.
# pragma GCC system_header
#endif
@ -2191,7 +2194,35 @@ inline void FormatDec(char *&buffer, T value) {
#define FMT_ADD_ARG_NAME(type, index) type arg##index
#define FMT_GET_ARG_NAME(type, index) arg##index
#define FMT_MAKE_ARG2(arg, index) fmt::Writer::MakeArg(arg)
#if FMT_USE_VARIADIC_TEMPLATES
/**
Defines a variadic function with the specified return type and argument
types passed as variable arguments.
Example::
std::string FormatMessage(int id, const char *format,
const fmt::ArgList &args) {
fmt::Writer w;
w.format("[{}] ", id);
w.format(format, args);
return w.str();
}
FMT_VARIADIC(std::string, FormatMessage, int, const char *)
*/
# define FMT_VARIADIC(return_type, func, ...) \
template<typename... Args> \
return_type func(FMT_FOR_EACH(FMT_ADD_ARG_NAME, __VA_ARGS__), \
const Args & ... args) { \
enum {N = fmt::internal::NonZero<sizeof...(Args)>::VALUE}; \
const fmt::internal::ArgInfo array[N] = {fmt::Writer::MakeArg(args)...}; \
return func(FMT_FOR_EACH(FMT_GET_ARG_NAME, __VA_ARGS__), \
fmt::ArgList(array, sizeof...(Args))); \
}
#else
// Defines a wrapper for a function taking __VA_ARGS__ arguments
// and n additional arguments of arbitrary types.
@ -2204,21 +2235,9 @@ inline void FormatDec(char *&buffer, T value) {
fmt::ArgList(args, sizeof(args) / sizeof(*args))); \
}
// Defines a variadic function with the specified return type and argument
// types passed as variable arguments.
// Example:
// std::string FormatMessage(const char *format, int id,
// const fmt::ArgList &args) {
// fmt::Writer w;
// w.format("[{}] ", id);
// w.format(format, args);
// return w.str();
// }
// FMT_VARIADIC(std::string, FormatMessage, int, const char *)
# define FMT_VARIADIC(return_type, func, ...) \
inline return_type func(FMT_FOR_EACH(FMT_ADD_ARG_NAME, __VA_ARGS__)) { \
return func(FMT_FOR_EACH(FMT_GET_ARG_NAME, __VA_ARGS__), \
fmt::ArgList()); \
return func(FMT_FOR_EACH(FMT_GET_ARG_NAME, __VA_ARGS__), fmt::ArgList()); \
} \
FMT_WRAP(return_type, func, 1, __VA_ARGS__) \
FMT_WRAP(return_type, func, 2, __VA_ARGS__) \
@ -2231,6 +2250,8 @@ inline void FormatDec(char *&buffer, T value) {
FMT_WRAP(return_type, func, 9, __VA_ARGS__) \
FMT_WRAP(return_type, func, 10, __VA_ARGS__)
#endif // FMT_USE_VARIADIC_TEMPLATES
// Restore warnings.
#if FMT_GCC_VERSION >= 406
# pragma GCC diagnostic pop