Function comptimePrint [src]

Prototype

pub inline fn comptimePrint(comptime fmt: []const u8, args: anytype) *const [count(fmt, args):0]u8

Parameters

fmt: []const u8

Example

 test comptimePrint {
    @setEvalBranchQuota(2000);
    try std.testing.expectEqual(*const [3:0]u8, @TypeOf(comptimePrint("{}", .{100})));
    try std.testing.expectEqualSlices(u8, "100", comptimePrint("{}", .{100}));
    try std.testing.expectEqualStrings("30", comptimePrint("{d}", .{30.0}));
    try std.testing.expectEqualStrings("30.0", comptimePrint("{d:3.1}", .{30.0}));
    try std.testing.expectEqualStrings("0.05", comptimePrint("{d}", .{0.05}));
    try std.testing.expectEqualStrings("5e-2", comptimePrint("{e}", .{0.05}));
}

Source

  pub inline fn comptimePrint(comptime fmt: []const u8, args: anytype) *const [count(fmt, args):0]u8 {
    comptime {
        var buf: [count(fmt, args):0]u8 = undefined;
        _ = bufPrint(&buf, fmt, args) catch unreachable;
        buf[buf.len] = 0;
        const final = buf;
        return &final;
    }
}  