std::lconv
STD：：Iconv
| Defined in header | | |
|---|---|---|
| struct lconv; | | |
全班std::lconv包含C语言环境定义的数字和货币格式规则。此结构的对象可以用std::localeconv...成员std::lconv是类型的值char和类型char*.每个char*成员除外decimal_point可能指向空字符%28，即空C-字符串%29。类型成员char都是非负数，其中任何一个都可能是CHAR_MAX如果对应的值在当前C语言环境中不可用。
成员对象
非货币数字格式参数
| char* decimal_point | the character used as the decimal point (public member object) |
|---|---|
| char* thousands_sep | the character used to separate groups of digits before the decimal point (public member object) |
| char* grouping | a string whose elements indicate the sizes of digit groups (public member object) |
货币数字格式参数
| char* mon_decimal_point | the character used as the decimal point (public member object) |
|---|---|
| char* mon_thousands_sep | the character used to separate groups of digits before the decimal point (public member object) |
| char* mon_grouping | a string whose elements indicate the sizes of digit groups (public member object) |
| char* positive_sign | a string used to indicate non-negative monetary quantity (public member object) |
| char* negative_sign | a string used to indicate negative monetary quantity (public member object) |
本地货币数字格式参数
| char* currency_symbol | the symbol used for currency in the current C locale (public member object) |
|---|---|
| char frac_digits | the number of digits after the decimal point to display in a monetary quantity (public member object) |
| char p_cs_precedes | 1 if currency_symbol is placed before non-negative value, 0 if after (public member object) |
| char n_cs_precedes | 1 if currency_symbol is placed before negative value, 0 if after (public member object) |
| char p_sep_by_space | indicates the separation of currency_symbol, positive_sign, and the non-negative monetary value (public member object) |
| char n_sep_by_space | indicates the separation of currency_symbol, negative_sign, and the negative monetary value (public member object) |
| char p_sign_posn | indicates the position of positive_sign in a non-negative monetary value (public member object) |
| char n_sign_posn | indicates the position of negative_sign in a negative monetary value (public member object) |
国际货币数字格式参数
| char* int_curr_symbol | the string used as international currency name in the current C locale (public member object) |
|---|---|
| char int_frac_digits | the number of digits after the decimal point to display in an international monetary quantity (public member object) |
| char int_p_cs_precedes (C++11) | 1 if currency_symbol is placed before non-negative international monetary value, 0 if after (public member object) |
| char int_n_cs_precedes (C++11) | 1 if currency_symbol is placed before negative international monetary value, 0 if after (public member object) |
| char int_p_sep_by_space (C++11) | indicates the separation of currency_symbol, positive_sign, and the non-negative international monetary value (public member object) |
| char int_n_sep_by_space (C++11) | indicates the separation of currency_symbol, negative_sign, and the negative international monetary value (public member object) |
| char int_p_sign_posn (C++11) | indicates the position of positive_sign in a non-negative international monetary value (public member object) |
| char int_n_sign_posn (C++11) | indicates the position of negative_sign in a negative international monetary value (public member object) |
所指向的C-字符串的字符。grouping和mon_grouping根据它们的数值进行解释。当终止'\0'遇到时，最后看到的值将被假定为对剩余的数字重复。如果CHAR_MAX遇到，则不会对其他数字进行分组。一次三位数的典型分组是"\003"...
的价值p_sep_by_space，，，n_sep_by_space，，，int_p_sep_by_space，，，int_n_sep_by_space解释如下：
| 0 | no space separates the currency symbol and the value |
|---|---|
| 1 | sign sticks to the currency symbol, value is separated by a space |
| 2 | sign sticks to the value. Currency symbol is separated by a space |
的价值p_sign_posn，，，n_sign_posn，，，int_p_sign_posn，，，int_n_sign_posn解释如下：
| 0 | parentheses around the value and the currency symbol are used to represent the sign |
|---|---|
| 1 | sign before the value and the currency symbol |
| 2 | sign after the value and the currency symbol |
| 3 | sign before the currency symbol |
| 4 | sign after the currency symbol |
例
二次
#include <clocale>
#include <iostream>
int main()
{
std::setlocale(LC_ALL, "ja_JP.UTF-8"
std::lconv* lc = std::localeconv(
std::cout << "Japanese currency symbol: " << lc->currency_symbol
<< '(' << lc->int_curr_symbol << ")\n";
}
二次
产出：
二次
Japanese currency symbol: ￥(JPY )
二次
另见
| localeconv | queries numeric and monetary formatting details of the current locale (function) |
|---|---|
| numpunct | defines numeric punctuation rules (class template) |
| moneypunct | defines monetary formatting parameters used by std::money_get and std::money_put (class template) |
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