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Simplify FMT_VARIADIC.

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This commit is contained in:
Victor Zverovich 2014-06-28 11:07:43 -07:00
parent 360bfbdd50
commit 2f6dddd6fd
3 changed files with 71 additions and 66 deletions
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118
format.h
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@ -872,16 +872,6 @@ public:
}
};
#if FMT_USE_VARIADIC_TEMPLATES
// Defines a variadic function returning void.
# define FMT_VARIADIC_VOID(func, arg_type) \
template<typename... Args> \
void func(arg_type arg1, const Args & ... args) { \
const BasicArg<> \
arg_array[fmt::internal::NonZero<sizeof...(Args)>::VALUE] = {args...}; \
func(arg1, ArgList(arg_array, sizeof...(Args))); \
}
#else
// Generates a comma-separated list with results of applying f to numbers 0..n-1.
# define FMT_GEN(n, f) FMT_GEN##n(f)
# define FMT_GEN1(f) f(0)
@ -899,9 +889,19 @@ public:
# define FMT_MAKE_ARG(n) const T##n &v##n
# define FMT_MAKE_REF(n) fmt::Writer::MakeArg(v##n)
#if FMT_USE_VARIADIC_TEMPLATES
// Defines a variadic function returning void.
# define FMT_VARIADIC_VOID(func, arg_type) \
template<typename... Args> \
void func(arg_type arg1, const Args & ... args) { \
const BasicArg<> \
arg_array[fmt::internal::NonZero<sizeof...(Args)>::VALUE] = {args...}; \
func(arg1, ArgList(arg_array, sizeof...(Args))); \
}
#else
// Defines a wrapper for a function taking one argument of type arg_type
// and n additional arguments of arbitrary types.
# define FMT_WRAP(func, arg_type, n) \
# define FMT_WRAP1(func, arg_type, n) \
template <FMT_GEN(n, FMT_MAKE_TEMPLATE_ARG)> \
inline void func(arg_type arg1, FMT_GEN(n, FMT_MAKE_ARG)) { \
const fmt::internal::ArgInfo args[] = {FMT_GEN(n, FMT_MAKE_REF)}; \
@ -910,11 +910,11 @@ public:
// Emulates a variadic function returning void on a pre-C++11 compiler.
# define FMT_VARIADIC_VOID(func, arg_type) \
FMT_WRAP(func, arg_type, 1) FMT_WRAP(func, arg_type, 2) \
FMT_WRAP(func, arg_type, 3) FMT_WRAP(func, arg_type, 4) \
FMT_WRAP(func, arg_type, 5) FMT_WRAP(func, arg_type, 6) \
FMT_WRAP(func, arg_type, 7) FMT_WRAP(func, arg_type, 8) \
FMT_WRAP(func, arg_type, 9) FMT_WRAP(func, arg_type, 10)
FMT_WRAP1(func, arg_type, 1) FMT_WRAP1(func, arg_type, 2) \
FMT_WRAP1(func, arg_type, 3) FMT_WRAP1(func, arg_type, 4) \
FMT_WRAP1(func, arg_type, 5) FMT_WRAP1(func, arg_type, 6) \
FMT_WRAP1(func, arg_type, 7) FMT_WRAP1(func, arg_type, 8) \
FMT_WRAP1(func, arg_type, 9) FMT_WRAP1(func, arg_type, 10)
#endif
// Generates a comma-separated list with results of applying f to pairs
@ -2183,61 +2183,51 @@ inline void FormatDec(char *&buffer, T value) {
#define FMT_FOR_EACH_ARG_N(_1, _2, _3, _4, _5, _6, _7, _8, N, ...) N
#define FMT_FOR_EACH_RSEQ_N() 8, 7, 6, 5, 4, 3, 2, 1, 0
#define FMT_FOR_EACH_(N, func, ...) \
FMT_CONCATENATE(FMT_FOR_EACH, N)(func, __VA_ARGS__)
#define FMT_FOR_EACH(func, ...) \
FMT_EXPAND(FMT_FOR_EACH_(FMT_FOR_EACH_NARG(__VA_ARGS__), func, __VA_ARGS__))
#define FMT_FOR_EACH_(N, func, ...) FMT_CONCATENATE(FMT_FOR_EACH, N)(func, __VA_ARGS__)
#define FMT_FOR_EACH(f, ...) \
FMT_EXPAND(FMT_FOR_EACH_(FMT_FOR_EACH_NARG(__VA_ARGS__), f, __VA_ARGS__))
#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)
#define FMT_VARIADIC(return_type, func_name, ...) \
inline return_type func_name(FMT_FOR_EACH(FMT_ADD_ARG_NAME, __VA_ARGS__)) { \
return func_name(FMT_FOR_EACH(FMT_GET_ARG_NAME, __VA_ARGS__), \
// Defines a wrapper for a function taking __VA_ARGS__ arguments
// and n additional arguments of arbitrary types.
# define FMT_WRAP(return_type, func, n, ...) \
template <FMT_GEN(n, FMT_MAKE_TEMPLATE_ARG)> \
inline return_type func(FMT_FOR_EACH(FMT_ADD_ARG_NAME, __VA_ARGS__), \
FMT_GEN(n, FMT_MAKE_ARG)) { \
const fmt::internal::ArgInfo args[] = {FMT_GEN(n, FMT_MAKE_REF)}; \
return func(FMT_FOR_EACH(FMT_GET_ARG_NAME, __VA_ARGS__), \
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 FormatError(int error_code, const char *format,
// const fmt::ArgList &args) {
// fmt::Writer w;
// w.format("Error {}: ", error_code);
// w.format(format, args);
// return w.str();
// }
// FMT_VARIADIC(std::string, FormatError, 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()); \
} \
template <typename T1> \
inline return_type func_name(FMT_FOR_EACH(FMT_ADD_ARG_NAME, __VA_ARGS__), \
const T1 &v1) { \
const fmt::internal::ArgInfo args[] = {FMT_FOR_EACH(FMT_MAKE_ARG2, v1)}; \
return func_name(FMT_FOR_EACH(FMT_GET_ARG_NAME, __VA_ARGS__), \
fmt::ArgList(args, sizeof(args) / sizeof(*args))); \
} \
template <typename T1, typename T2> \
inline return_type func_name(FMT_FOR_EACH(FMT_ADD_ARG_NAME, __VA_ARGS__), \
const T1 &v1, const T2 &v2) { \
const fmt::internal::ArgInfo args[] = {FMT_FOR_EACH(FMT_MAKE_ARG2, v1, v2)}; \
return func_name(FMT_FOR_EACH(FMT_GET_ARG_NAME, __VA_ARGS__), \
fmt::ArgList(args, sizeof(args) / sizeof(*args))); \
} \
template <typename T1, typename T2, typename T3> \
inline return_type func_name(FMT_FOR_EACH(FMT_ADD_ARG_NAME, __VA_ARGS__), \
const T1 &v1, const T2 &v2, const T3 &v3) { \
const fmt::internal::ArgInfo args[] = { \
FMT_FOR_EACH(FMT_MAKE_ARG2, v1, v2, v3) \
}; \
return func_name(FMT_FOR_EACH(FMT_GET_ARG_NAME, __VA_ARGS__), \
fmt::ArgList(args, sizeof(args) / sizeof(*args))); \
} \
template <typename T1, typename T2, typename T3, typename T4> \
inline return_type func_name(FMT_FOR_EACH(FMT_ADD_ARG_NAME, __VA_ARGS__), \
const T1 &v1, const T2 &v2, const T3 &v3, const T4 &v4) { \
const fmt::internal::ArgInfo args[] = { \
FMT_FOR_EACH(FMT_MAKE_ARG2, v1, v2, v3, v4) \
}; \
return func_name(FMT_FOR_EACH(FMT_GET_ARG_NAME, __VA_ARGS__), \
fmt::ArgList(args, sizeof(args) / sizeof(*args))); \
} \
template <typename T1, typename T2, typename T3, typename T4, typename T5> \
inline return_type func_name(FMT_FOR_EACH(FMT_ADD_ARG_NAME, __VA_ARGS__), \
const T1 &v1, const T2 &v2, const T3 &v3, const T4 &v4, const T5 &v5) { \
const fmt::internal::ArgInfo args[] = { \
FMT_FOR_EACH(FMT_MAKE_ARG2, v1, v2, v3, v4, v5) \
}; \
return func_name(FMT_FOR_EACH(FMT_GET_ARG_NAME, __VA_ARGS__), \
fmt::ArgList(args, sizeof(args) / sizeof(*args))); \
}
FMT_WRAP(return_type, func, 1, __VA_ARGS__) \
FMT_WRAP(return_type, func, 2, __VA_ARGS__) \
FMT_WRAP(return_type, func, 3, __VA_ARGS__) \
FMT_WRAP(return_type, func, 4, __VA_ARGS__) \
FMT_WRAP(return_type, func, 5, __VA_ARGS__) \
FMT_WRAP(return_type, func, 6, __VA_ARGS__) \
FMT_WRAP(return_type, func, 7, __VA_ARGS__) \
FMT_WRAP(return_type, func, 8, __VA_ARGS__) \
FMT_WRAP(return_type, func, 9, __VA_ARGS__) \
FMT_WRAP(return_type, func, 10, __VA_ARGS__)
// Restore warnings.
#if FMT_GCC_VERSION >= 406

15
test/format-test.cc
View File

@ -1676,3 +1676,18 @@ TEST(FormatTest, VariadicMacro) {
EXPECT_EQ("42 abc", test(42, " {}", "abc"));
EXPECT_EQ("42 abc 1.2", test(42, " {} {}", "abc", 1.2));
}
std::string FormatError(int error_code, const char *format,
const fmt::ArgList &args) {
fmt::Writer w;
w.format("Error {}: ", error_code);
w.format(format, args);
return w.str();
}
FMT_VARIADIC(std::string, FormatError, int, const char *)
TEST(FormatTest, FormatError) {
EXPECT_EQ("Error 42: something happened",
FormatError(42, "{} happened", "something"));
}

4
test/macro-test.cc
View File

@ -59,9 +59,9 @@ int result;
}
MAKE_TEST(TestFunc)
FMT_WRAP(TestFunc, const char *, 1)
FMT_WRAP1(TestFunc, const char *, 1)
TEST(UtilTest, Template) {
TEST(UtilTest, Wrap1) {
result = 0;
TestFunc("", 42);
EXPECT_EQ(42, result);