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capture of this: support C++14 & C++20 via macro

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This commit is contained in:
Markus Werle 2020-05-07 22:55:27 +02:00
parent 818f65e30a
commit 91251b9069
1 changed files with 23 additions and 17 deletions
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40
include/fmt/format.h
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@ -172,6 +172,12 @@ FMT_END_NAMESPACE
# define FMT_BUILTIN_CLZLL(n) __builtin_clzll(n)
#endif
#if (__cplusplus >= 201703L)
# define FMT_CAPTURE_OF_THIS , this
#else
# define FMT_CAPTURE_OF_THIS
#endif
// Some compilers masquerade as both MSVC and GCC-likes or otherwise support
// __builtin_clz and __builtin_clzll, so only define FMT_BUILTIN_CLZ using the
// MSVC intrinsics if the clz and clzll builtins are not available.
@ -1467,10 +1473,10 @@ template <typename OutputIt, typename Char, typename UInt> struct int_writer {
void on_dec() {
auto num_digits = count_digits(abs_value);
out =
write_int(out, num_digits, get_prefix(), specs, [=, this](iterator it) {
return format_decimal<Char>(it, abs_value, num_digits);
});
out = write_int(out, num_digits, get_prefix(), specs,
[= FMT_CAPTURE_OF_THIS](iterator it) {
return format_decimal<Char>(it, abs_value, num_digits);
});
}
void on_hex() {
@ -1479,11 +1485,11 @@ template <typename OutputIt, typename Char, typename UInt> struct int_writer {
prefix[prefix_size++] = specs.type;
}
int num_digits = count_digits<4>(abs_value);
out =
write_int(out, num_digits, get_prefix(), specs, [=, this](iterator it) {
return format_uint<4, Char>(it, abs_value, num_digits,
specs.type != 'x');
});
out = write_int(out, num_digits, get_prefix(), specs,
[= FMT_CAPTURE_OF_THIS](iterator it) {
return format_uint<4, Char>(it, abs_value, num_digits,
specs.type != 'x');
});
}
void on_bin() {
@ -1492,10 +1498,10 @@ template <typename OutputIt, typename Char, typename UInt> struct int_writer {
prefix[prefix_size++] = static_cast<char>(specs.type);
}
int num_digits = count_digits<1>(abs_value);
out =
write_int(out, num_digits, get_prefix(), specs, [=, this](iterator it) {
return format_uint<1, Char>(it, abs_value, num_digits);
});
out = write_int(out, num_digits, get_prefix(), specs,
[= FMT_CAPTURE_OF_THIS](iterator it) {
return format_uint<1, Char>(it, abs_value, num_digits);
});
}
void on_oct() {
@ -1505,10 +1511,10 @@ template <typename OutputIt, typename Char, typename UInt> struct int_writer {
// is not greater than the number of digits.
prefix[prefix_size++] = '0';
}
out =
write_int(out, num_digits, get_prefix(), specs, [=, this](iterator it) {
return format_uint<3, Char>(it, abs_value, num_digits);
});
out = write_int(out, num_digits, get_prefix(), specs,
[= FMT_CAPTURE_OF_THIS](iterator it) {
return format_uint<3, Char>(it, abs_value, num_digits);
});
}
enum { sep_size = 1 };