std::ios_base::fmtflags(3) C++ Standard Libary std::ios_base::fmtflags(3) NAME std::ios_base::fmtflags - std::ios_base::fmtflags Synopsis typedef /*implementation defined*/ fmtflags; static constexpr fmtflags dec = /*implementation defined*/ static constexpr fmtflags oct = /*implementation defined*/ static constexpr fmtflags hex = /*implementation defined*/ static constexpr fmtflags basefield = dec | oct | hex; static constexpr fmtflags left = /*implementation defined*/ static constexpr fmtflags right = /*implementation defined*/ static constexpr fmtflags internal = /*implementation defined*/ static constexpr fmtflags adjustfield = left | right | internal; static constexpr fmtflags scientific = /*implementation defined*/ static constexpr fmtflags fixed = /*implementation defined*/ static constexpr fmtflags floatfield = scientific | fixed; static constexpr fmtflags boolalpha = /*implementation defined*/ static constexpr fmtflags showbase = /*implementation defined*/ static constexpr fmtflags showpoint = /*implementation defined*/ static constexpr fmtflags showpos = /*implementation defined*/ static constexpr fmtflags skipws = /*implementation defined*/ static constexpr fmtflags unitbuf = /*implementation defined*/ static constexpr fmtflags uppercase = /*implementation defined*/ Specifies available formatting flags. It is a BitmaskType. The following constants are defined: Constant Explanation dec use decimal base for integer I/O: see std::dec oct use octal base for integer I/O: see std::oct hex use hexadecimal base for integer I/O: see std::hex basefield dec | oct | hex. Useful for masking operations left left adjustment (adds fill characters to the right): see std::left right right adjustment (adds fill characters to the left): see std::right internal internal adjustment (adds fill characters to the internal designated point): see std::internal adjustfield left | right | internal. Useful for masking operations scientific generate floating point types using scientific notation, or hex notation if combined with fixed: see std::scientific fixed generate floating point types using fixed notation, or hex notation if combined with scientific: see std::fixed floatfield scientific | fixed. Useful for masking operations boolalpha insert and extract bool type in alphanumeric format: see std::boolalpha showbase generate a prefix indicating the numeric base for integer output, require the currency indicator in monetary I/O: see std::showbase showpoint generate a decimal-point character unconditionally for floating-point number output: see std::showpoint showpos generate a + character for non-negative numeric output: see std::showpos skipws skip leading whitespace before certain input operations: see std::skipws unitbuf flush the output after each output operation: see std::unit- buf uppercase replace certain lowercase letters with their uppercase equivalents in certain output operations: see std::uppercase Example The following example shows several different ways to print the same re- sult. // Run this code #include <iostream> int main() { const int num = 150; // using fmtflags as class member constants: std::cout.setf(std::ios_base::hex, std::ios_base::basefield); std::cout.setf(std::ios_base::showbase); std::cout << num << '\n'; // using fmtflags as inherited class member constants: std::cout.setf (std::ios::hex, std::ios::basefield); std::cout.setf (std::ios::showbase); std::cout << num << '\n'; // using fmtflags as object member constants: std::cout.setf(std::cout.hex, std::cout.basefield); std::cout.setf(std::cout.showbase); std::cout << num << '\n'; // using fmtflags as a type: std::ios_base::fmtflags ff; ff = std::cout.flags(); ff &= ~std::cout.basefield; // unset basefield bits ff |= std::cout.hex; // set hex ff |= std::cout.showbase; // set showbase std::cout.flags(ff); std::cout << num << '\n'; // not using fmtflags, but using manipulators: std::cout << std::hex << std::showbase << num << '\n'; } Output: 0x96 0x96 0x96 0x96 0x96 See also flags manages format flags (public member function) setf sets specific format flag (public member function) unsetf clears specific format flag (public member function) setbase changes the base used for integer I/O (function) setfill changes the fill character (function template) fixed scientific hexfloat changes formatting used for floating-point I/O defaultfloat (function) (C++11) (C++11) showbase controls whether prefix is used to indicate numeric base noshowbase (function) boolalpha switches between textual and numeric representation of booleans noboolalpha (function) showpos controls whether the + sign used with non-negative numbers noshowpos (function) showpoint controls whether decimal point is always included in float- ing-point noshowpoint representation (function) unitbuf controls whether output is flushed after each operation nounitbuf (function) skipws controls whether leading whitespace is skipped on input noskipws (function) uppercase controls whether uppercase characters are used with some output formats nouppercase (function) http://cppreference.com 2024.06.10 std::ios_base::fmtflags(3)
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