to_hex for wchar_t buffers

[zkheraj]

Is it possible to dump the wchar_t buffer as we do for char buffers ?
e.g.

void binary_example()
{
std::vector buf(80);
for (int i = 0; i < 80; i++)
{
buf.push_back(static_cast(i & 0xff));
}
spdlog::info("Binary example: {}", spdlog::to_hex(buf));
spdlog::info("Another binary example:{:n}", spdlog::to_hex(std::begin(buf), std::begin(buf) + 10));
// more examples:
spdlog::info("uppercase: {:X}", spdlog::to_hex(buf));
spdlog::info("uppercase, no delimiters: {:Xs}", spdlog::to_hex(buf));
spdlog::info("uppercase, no delimiters, no position info: {:Xsp}", spdlog::to_hex(buf));
spdlog::info("hexdump style: {:a}", spdlog::to_hex(buf));
spdlog::info("hexdump style, 20 chars per line {:a}", spdlog::to_hex(buf, 20));
}

[tt4g]

It looks like it can be done as far as the template is concerned.

EDIT: I noticed that the build fails because char is used in fmt::formatter<spdlog::details::dump_info<T>, char>.
You must add your own fmt::formatter<spdlog::details::dump_info<T>, wchar_t> to make it work (PR is welcome).

x and X may be alternatively substituted with functions from the fmt library.

#include <vector>
#include <fmt/core.h>
#include <fmt/ranges.h>

int main() {
    std::vector<int> vec{{10, 20, 30}};

    fmt::print(L"{:02x}\n", fmt::join(vec, L" ")); // 0a 14 1e
    fmt::print(L"{:02X}\n", fmt::join(vec, L" ")); // 0A 14 1E

    fmt::print(L"{:#04x}\n", fmt::join(vec, L" ")); // 0x0a 0x14 0x1e
    fmt::print(L"{:#04X}\n", fmt::join(vec, L" ")); // 0X0A 0X14 0X1E
}

See also: https://fmt.dev/9.1.0/syntax.html